MS Selected Page Inactivate RibbonGroup

EnvelopeGenerator.Form/frmMain.vb

@@ -161,4 +161,12 @@ Public Class frmMain
         TempFiles.CleanUp()
     End Sub
 
+    Private Sub XtraTabControl1_SelectedPageChanged(sender As Object, e As DevExpress.XtraTab.TabPageChangedEventArgs) Handles XtraTabControl1.SelectedPageChanged
+        Select Case XtraTabControl1.SelectedTabPageIndex
+            Case 1
+                RibbonPageEnvelopeActions.Enabled = False
+            Case 0
+                RibbonPageEnvelopeActions.Enabled = True
+        End Select
+    End Sub
 End Class