diff --git a/GUIs.Test.EDMIBenchmark/Form1.vb b/GUIs.Test.EDMIBenchmark/Form1.vb
index cd35bc0d..f4f9fc13 100644
--- a/GUIs.Test.EDMIBenchmark/Form1.vb
+++ b/GUIs.Test.EDMIBenchmark/Form1.vb
@@ -61,8 +61,8 @@ Public Class Form1
 
                 AddLogMessage($"Importing {oFileInfo.Name}... ({FormatBytes(oFileInfo.Length)})")
 
-                Dim oObjectId As Long = Await _Client.ImportFileAsync(oFileInfo.FullName, "WichtigesDokument", 1, 0)
-                AddLogMessage($"File with Id [{oObjectId}] imported!")
+                'Dim oObjectId As Long = Await _Client.ImportFileAsync(oFileInfo.FullName, "WichtigesDokument", 1, 0)
+                'AddLogMessage($"File with Id [{oObjectId}] imported!")
                 oCountFiles += 1
                 oSW.Stop()
                 AddLogMessage($"Import Time: {FormatTime(oSW.ElapsedMilliseconds)}")
diff --git a/GUIs.Test.TestGUI/My Project/Application.Designer.vb b/GUIs.Test.TestGUI/My Project/Application.Designer.vb
index ac66efcf..9942632e 100644
--- a/GUIs.Test.TestGUI/My Project/Application.Designer.vb	
+++ b/GUIs.Test.TestGUI/My Project/Application.Designer.vb	
@@ -32,7 +32,7 @@ Namespace My
         
         <Global.System.Diagnostics.DebuggerStepThroughAttribute()>  _
         Protected Overrides Sub OnCreateMainForm()
-            Me.MainForm = Global.TestGUI.frmStart
+            Me.MainForm = Global.TestGUI.frmDocViewPure
         End Sub
     End Class
 End Namespace
diff --git a/GUIs.Test.TestGUI/My Project/Application.myapp b/GUIs.Test.TestGUI/My Project/Application.myapp
index a1da81d5..19b75e50 100644
--- a/GUIs.Test.TestGUI/My Project/Application.myapp	
+++ b/GUIs.Test.TestGUI/My Project/Application.myapp	
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <MyApplicationData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <MySubMain>true</MySubMain>
-  <MainForm>frmStart</MainForm>
+  <MainForm>frmDocViewPure</MainForm>
   <SingleInstance>false</SingleInstance>
   <ShutdownMode>0</ShutdownMode>
   <EnableVisualStyles>true</EnableVisualStyles>
diff --git a/GUIs.Test.TestGUI/My Project/licenses.licx b/GUIs.Test.TestGUI/My Project/licenses.licx
index c0ffb89a..8918c8d4 100644
--- a/GUIs.Test.TestGUI/My Project/licenses.licx	
+++ b/GUIs.Test.TestGUI/My Project/licenses.licx	
@@ -1,6 +1,7 @@
-DevExpress.XtraEditors.LookUpEdit, DevExpress.XtraEditors.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
-DevExpress.XtraWizard.WizardControl, DevExpress.XtraWizard.v18.1, Version=18.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
-DevExpress.XtraEditors.GridLookUpEdit, DevExpress.XtraGrid.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
-DevExpress.XtraGrid.GridControl, DevExpress.XtraGrid.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
 DevExpress.XtraEditors.GridLookUpEdit, DevExpress.XtraGrid.v18.1, Version=18.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
+DevExpress.XtraEditors.LookUpEdit, DevExpress.XtraEditors.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
+DevExpress.XtraGrid.GridControl, DevExpress.XtraGrid.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
+DevExpress.XtraSpreadsheet.SpreadsheetControl, DevExpress.XtraSpreadsheet.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
+DevExpress.XtraEditors.GridLookUpEdit, DevExpress.XtraGrid.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
 DevExpress.XtraGrid.GridControl, DevExpress.XtraGrid.v18.1, Version=18.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
+DevExpress.XtraWizard.WizardControl, DevExpress.XtraWizard.v18.1, Version=18.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a
diff --git a/GUIs.Test.TestGUI/TestGUI.vbproj b/GUIs.Test.TestGUI/TestGUI.vbproj
index cc9c41cf..427e3b5e 100644
--- a/GUIs.Test.TestGUI/TestGUI.vbproj
+++ b/GUIs.Test.TestGUI/TestGUI.vbproj
@@ -51,10 +51,30 @@
     <ApplicationManifest>My Project\app.manifest</ApplicationManifest>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="DevExpress.Charts.v19.2.Core, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
     <Reference Include="DevExpress.Data.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
+    <Reference Include="DevExpress.DataAccess.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.DataAccess.v19.2.UI, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.Office.v19.2.Core, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.Printing.v19.2.Core, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.RichEdit.v19.2.Core, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.Spreadsheet.v19.2.Core, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
     <Reference Include="DevExpress.Utils.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
+    <Reference Include="DevExpress.Utils.v19.2.UI, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraBars.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraCharts.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
     <Reference Include="DevExpress.XtraEditors.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
     <Reference Include="DevExpress.XtraGrid.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" />
+    <Reference Include="DevExpress.XtraLayout.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraNavBar.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraPrinting.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraRichEdit.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraSpreadsheet.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="DevExpress.XtraTreeList.v19.2, Version=19.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL" />
+    <Reference Include="GdPicture.NET.14, Version=14.1.0.97, Culture=neutral, PublicKeyToken=f52a2e60ad468dbb, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>D:\ProgramFiles\GdPicture.NET 14\Redist\GdPicture.NET (.NET Framework 4.5)\GdPicture.NET.14.dll</HintPath>
+    </Reference>
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="Microsoft.Extensions.Logging.Abstractions, Version=2.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60, processorArchitecture=MSIL">
       <HintPath>..\packages\Microsoft.Extensions.Logging.Abstractions.2.1.1\lib\netstandard2.0\Microsoft.Extensions.Logging.Abstractions.dll</HintPath>
@@ -125,6 +145,18 @@
     <Compile Include="frmConfigTest.vb">
       <SubType>Form</SubType>
     </Compile>
+    <Compile Include="frmDocView.Designer.vb">
+      <DependentUpon>frmDocView.vb</DependentUpon>
+    </Compile>
+    <Compile Include="frmDocView.vb">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="frmDocViewPure.Designer.vb">
+      <DependentUpon>frmDocViewPure.vb</DependentUpon>
+    </Compile>
+    <Compile Include="frmDocViewPure.vb">
+      <SubType>Form</SubType>
+    </Compile>
     <Compile Include="frmFilesystem.Designer.vb">
       <DependentUpon>frmFilesystem.vb</DependentUpon>
     </Compile>
@@ -166,6 +198,7 @@
     <Compile Include="My Project\Application.Designer.vb">
       <AutoGen>True</AutoGen>
       <DependentUpon>Application.myapp</DependentUpon>
+      <DesignTime>True</DesignTime>
     </Compile>
     <Compile Include="My Project\Resources.Designer.vb">
       <AutoGen>True</AutoGen>
@@ -185,6 +218,12 @@
     <EmbeddedResource Include="frmConfigTest.resx">
       <DependentUpon>frmConfigTest.vb</DependentUpon>
     </EmbeddedResource>
+    <EmbeddedResource Include="frmDocView.resx">
+      <DependentUpon>frmDocView.vb</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="frmDocViewPure.resx">
+      <DependentUpon>frmDocViewPure.vb</DependentUpon>
+    </EmbeddedResource>
     <EmbeddedResource Include="frmFilesystem.resx">
       <DependentUpon>frmFilesystem.vb</DependentUpon>
     </EmbeddedResource>
@@ -229,6 +268,10 @@
     <WCFMetadata Include="Connected Services\" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\Controls.DocumentViewer\DocumentViewer.vbproj">
+      <Project>{0958cddf-4a16-41f6-8837-8335f71d599c}</Project>
+      <Name>DocumentViewer</Name>
+    </ProjectReference>
     <ProjectReference Include="..\Controls.LookupGrid\LookupControl.vbproj">
       <Project>{3dcd6d1a-c830-4241-b7e4-27430e7ea483}</Project>
       <Name>LookupControl</Name>
diff --git a/GUIs.Test.TestGUI/frmDocView.Designer.vb b/GUIs.Test.TestGUI/frmDocView.Designer.vb
new file mode 100644
index 00000000..b6da649b
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocView.Designer.vb
@@ -0,0 +1,92 @@
+<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
+Partial Class frmDocView
+    Inherits System.Windows.Forms.Form
+
+    'Das Formular überschreibt den Löschvorgang, um die Komponentenliste zu bereinigen.
+    <System.Diagnostics.DebuggerNonUserCode()> _
+    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
+        Try
+            If disposing AndAlso components IsNot Nothing Then
+                components.Dispose()
+            End If
+        Finally
+            MyBase.Dispose(disposing)
+        End Try
+    End Sub
+
+    'Wird vom Windows Form-Designer benötigt.
+    Private components As System.ComponentModel.IContainer
+
+    'Hinweis: Die folgende Prozedur ist für den Windows Form-Designer erforderlich.
+    'Das Bearbeiten ist mit dem Windows Form-Designer möglich.  
+    'Das Bearbeiten mit dem Code-Editor ist nicht möglich.
+    <System.Diagnostics.DebuggerStepThrough()> _
+    Private Sub InitializeComponent()
+        Me.DocumentViewer1 = New DigitalData.Controls.DocumentViewer.DocumentViewer()
+        Me.Panel1 = New System.Windows.Forms.Panel()
+        Me.TextBox1 = New System.Windows.Forms.TextBox()
+        Me.Button1 = New System.Windows.Forms.Button()
+        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
+        Me.Panel1.SuspendLayout()
+        Me.SuspendLayout()
+        '
+        'DocumentViewer1
+        '
+        Me.DocumentViewer1.Dock = System.Windows.Forms.DockStyle.Bottom
+        Me.DocumentViewer1.FileLoaded = False
+        Me.DocumentViewer1.Location = New System.Drawing.Point(0, 43)
+        Me.DocumentViewer1.Name = "DocumentViewer1"
+        Me.DocumentViewer1.Size = New System.Drawing.Size(1079, 463)
+        Me.DocumentViewer1.TabIndex = 0
+        '
+        'Panel1
+        '
+        Me.Panel1.Controls.Add(Me.Button1)
+        Me.Panel1.Controls.Add(Me.TextBox1)
+        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
+        Me.Panel1.Location = New System.Drawing.Point(0, 0)
+        Me.Panel1.Name = "Panel1"
+        Me.Panel1.Size = New System.Drawing.Size(1079, 43)
+        Me.Panel1.TabIndex = 1
+        '
+        'TextBox1
+        '
+        Me.TextBox1.Location = New System.Drawing.Point(12, 12)
+        Me.TextBox1.Name = "TextBox1"
+        Me.TextBox1.Size = New System.Drawing.Size(846, 20)
+        Me.TextBox1.TabIndex = 0
+        '
+        'Button1
+        '
+        Me.Button1.Location = New System.Drawing.Point(864, 10)
+        Me.Button1.Name = "Button1"
+        Me.Button1.Size = New System.Drawing.Size(75, 23)
+        Me.Button1.TabIndex = 1
+        Me.Button1.Text = "Open File"
+        Me.Button1.UseVisualStyleBackColor = True
+        '
+        'OpenFileDialog1
+        '
+        Me.OpenFileDialog1.FileName = "OpenFileDialog1"
+        '
+        'frmDocView
+        '
+        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
+        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
+        Me.ClientSize = New System.Drawing.Size(1079, 506)
+        Me.Controls.Add(Me.Panel1)
+        Me.Controls.Add(Me.DocumentViewer1)
+        Me.Name = "frmDocView"
+        Me.Text = "frmDocView"
+        Me.Panel1.ResumeLayout(False)
+        Me.Panel1.PerformLayout()
+        Me.ResumeLayout(False)
+
+    End Sub
+
+    Friend WithEvents DocumentViewer1 As DigitalData.Controls.DocumentViewer.DocumentViewer
+    Friend WithEvents Panel1 As Panel
+    Friend WithEvents Button1 As Button
+    Friend WithEvents TextBox1 As TextBox
+    Friend WithEvents OpenFileDialog1 As OpenFileDialog
+End Class
diff --git a/GUIs.Test.TestGUI/frmDocView.resx b/GUIs.Test.TestGUI/frmDocView.resx
new file mode 100644
index 00000000..33c7f672
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocView.resx
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="OpenFileDialog1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmDocView.vb b/GUIs.Test.TestGUI/frmDocView.vb
new file mode 100644
index 00000000..0c51674e
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocView.vb
@@ -0,0 +1,16 @@
+Imports DigitalData.Modules.Logging
+
+Public Class frmDocView
+    Private LogConfig As LogConfig
+
+    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
+        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
+            DocumentViewer1.LoadFile(OpenFileDialog1.FileName)
+        End If
+    End Sub
+
+    Private Sub frmDocView_Load(sender As Object, e As EventArgs) Handles Me.Load
+        LogConfig = New LogConfig(LogConfig.PathType.Temp)
+        DocumentViewer1.Init(LogConfig, "21182889975216572111813147150675976632")
+    End Sub
+End Class
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmDocViewPure.Designer.vb b/GUIs.Test.TestGUI/frmDocViewPure.Designer.vb
new file mode 100644
index 00000000..fdbabb49
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocViewPure.Designer.vb
@@ -0,0 +1,61 @@
+<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
+Partial Class frmDocViewPure
+    Inherits System.Windows.Forms.Form
+
+    'Das Formular überschreibt den Löschvorgang, um die Komponentenliste zu bereinigen.
+    <System.Diagnostics.DebuggerNonUserCode()> _
+    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
+        Try
+            If disposing AndAlso components IsNot Nothing Then
+                components.Dispose()
+            End If
+        Finally
+            MyBase.Dispose(disposing)
+        End Try
+    End Sub
+
+    'Wird vom Windows Form-Designer benötigt.
+    Private components As System.ComponentModel.IContainer
+
+    'Hinweis: Die folgende Prozedur ist für den Windows Form-Designer erforderlich.
+    'Das Bearbeiten ist mit dem Windows Form-Designer möglich.  
+    'Das Bearbeiten mit dem Code-Editor ist nicht möglich.
+    <System.Diagnostics.DebuggerStepThrough()> _
+    Private Sub InitializeComponent()
+        Me.SpreadsheetControl1 = New DevExpress.XtraSpreadsheet.SpreadsheetControl()
+        Me.Button1 = New System.Windows.Forms.Button()
+        Me.SuspendLayout()
+        '
+        'SpreadsheetControl1
+        '
+        Me.SpreadsheetControl1.Location = New System.Drawing.Point(228, 101)
+        Me.SpreadsheetControl1.Name = "SpreadsheetControl1"
+        Me.SpreadsheetControl1.Size = New System.Drawing.Size(400, 200)
+        Me.SpreadsheetControl1.TabIndex = 0
+        Me.SpreadsheetControl1.Text = "SpreadsheetControl1"
+        '
+        'Button1
+        '
+        Me.Button1.Location = New System.Drawing.Point(546, 25)
+        Me.Button1.Name = "Button1"
+        Me.Button1.Size = New System.Drawing.Size(75, 23)
+        Me.Button1.TabIndex = 1
+        Me.Button1.Text = "unload"
+        Me.Button1.UseVisualStyleBackColor = True
+        '
+        'frmDocViewPure
+        '
+        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
+        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
+        Me.ClientSize = New System.Drawing.Size(800, 450)
+        Me.Controls.Add(Me.Button1)
+        Me.Controls.Add(Me.SpreadsheetControl1)
+        Me.Name = "frmDocViewPure"
+        Me.Text = "frmDocViewPure"
+        Me.ResumeLayout(False)
+
+    End Sub
+
+    Friend WithEvents SpreadsheetControl1 As DevExpress.XtraSpreadsheet.SpreadsheetControl
+    Friend WithEvents Button1 As Button
+End Class
diff --git a/GUIs.Test.TestGUI/frmDocViewPure.resx b/GUIs.Test.TestGUI/frmDocViewPure.resx
new file mode 100644
index 00000000..1af7de15
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocViewPure.resx
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmDocViewPure.vb b/GUIs.Test.TestGUI/frmDocViewPure.vb
new file mode 100644
index 00000000..012a6d02
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmDocViewPure.vb
@@ -0,0 +1,15 @@
+Imports GdPicture14
+
+Public Class frmDocViewPure
+    Private Sub frmDocViewPure_Load(sender As Object, e As EventArgs) Handles MyBase.Load
+        SpreadsheetControl1.LoadDocument("E:\35MB.xlsx")
+
+    End Sub
+
+    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
+        SpreadsheetControl1.Document.Dispose()
+        SpreadsheetControl1.Dispose()
+        SpreadsheetControl1 = Nothing
+
+    End Sub
+End Class
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmStart.Designer.vb b/GUIs.Test.TestGUI/frmStart.Designer.vb
index 4bb83fcf..85f55445 100644
--- a/GUIs.Test.TestGUI/frmStart.Designer.vb
+++ b/GUIs.Test.TestGUI/frmStart.Designer.vb
@@ -27,6 +27,7 @@ Partial Class frmStart
         Me.Button3 = New System.Windows.Forms.Button()
         Me.Button4 = New System.Windows.Forms.Button()
         Me.Button5 = New System.Windows.Forms.Button()
+        Me.Button6 = New System.Windows.Forms.Button()
         Me.SuspendLayout()
         '
         'Button1
@@ -71,14 +72,24 @@ Partial Class frmStart
         Me.Button5.Name = "Button5"
         Me.Button5.Size = New System.Drawing.Size(236, 60)
         Me.Button5.TabIndex = 2
-        Me.Button5.Text = "Button5"
+        Me.Button5.Text = "Checksum"
         Me.Button5.UseVisualStyleBackColor = True
         '
+        'Button6
+        '
+        Me.Button6.Location = New System.Drawing.Point(12, 326)
+        Me.Button6.Name = "Button6"
+        Me.Button6.Size = New System.Drawing.Size(236, 60)
+        Me.Button6.TabIndex = 2
+        Me.Button6.Text = "DocView"
+        Me.Button6.UseVisualStyleBackColor = True
+        '
         'frmStart
         '
         Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
         Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
         Me.ClientSize = New System.Drawing.Size(800, 450)
+        Me.Controls.Add(Me.Button6)
         Me.Controls.Add(Me.Button5)
         Me.Controls.Add(Me.Button4)
         Me.Controls.Add(Me.Button3)
@@ -95,4 +106,5 @@ Partial Class frmStart
     Friend WithEvents Button3 As Button
     Friend WithEvents Button4 As Button
     Friend WithEvents Button5 As Button
+    Friend WithEvents Button6 As Button
 End Class
diff --git a/GUIs.Test.TestGUI/frmStart.vb b/GUIs.Test.TestGUI/frmStart.vb
index ce2fcd0f..77259d3a 100644
--- a/GUIs.Test.TestGUI/frmStart.vb
+++ b/GUIs.Test.TestGUI/frmStart.vb
@@ -22,4 +22,8 @@ Public Class frmStart
     Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
         frmChecksum.Show()
     End Sub
+
+    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
+        frmDocView.Show()
+    End Sub
 End Class
\ No newline at end of file