LookupGrid: first version of LookupControl3

GUIs.Test.TestGUI/frmLookup.vb

@@ -18,8 +18,8 @@ Public Class frmLookup
         Dim oFirstColumn = GridView1.Columns.First()
         Dim oEditor2 As New RepositoryItemLookupControl3() With {
             .DataSource = GetDatatable(10),
-            .[ReadOnly] = False,
-            .MultiSelect = False
+            .DisplayMember = "Col1",
+            .ValueMember = "Col1"
         }
 
         GridControl1.RepositoryItems.Add(oEditor2)