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Microsoft KB Archive/172275

From BetaArchive Wiki

Article ID: 172275

Article Last Modified on 3/2/2005


  • Microsoft Visual Basic 4.0 Professional Edition
  • Microsoft Visual Basic 4.0 Enterprise Edition

This article was previously published under Q172275


The mouse does not select items in the drop-down combo box of DBCombo on a Modal Form in an executable.


To resolve this problem, upgrade to Visual Basic 6.0.

In Visual Basic 4.0, the following code will work around the problem:

   Private Sub Form_Initialize()
   ' Loop thru each form in the FormS collection
   For Each Form in Forms
   'Find each form that is not the current form
     If Form.Name <> Me. Name Then
       Form. Enabled = True ' and Disable it
     End If
   End Sub

   Private Sub Form_Unload()

   ' Loop thru each form in the FormS collection
   For Each Form in Forms

   'Re-enable all the forms in the FormS collection
     If Form.Name <> Me. Name Then
       Form. Enabled = True
   End If

   End Sub


Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Microsoft Visual Basic Professional and Enterprise editions, version 6.0.


Steps to Reproduce Behavior

  1. Create a New Project in Visual Basic 4.0.
  2. Insert a module.
  3. Add the following code:

          Sub main()
             Form1.Show vbModal
          End Sub
  4. On Form1, add a Data Control (Data1) and a DBCombo (DBCombo1). Set the following properties:

          Data1.DatabaseName = biblio.mdb
          Data1.Recordsource = Authors
          DBCombo1.RowSource = Data1
          DBCombo1.ListField = Author
  5. Under the Tools menu, select Options.
  6. Select the Project Tab.
  7. Set the Main Procedure for the Startup Form.
  8. Build an executable.
  9. Run the executable.
  10. Drop down the combo box, and try to select an option.


For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

150210 FIX: DBCombo Control Does Not Allow Selection on Modal Form

Additional query words: vb

Keywords: kbbug kbfix kbvbp600fix KB172275