XL97: Invalid Page Fault Using DropDown Method with ComboBox

ID: Q166093

The information in this article applies to:

Microsoft Excel 97 for Windows

SYMPTOMS

When you use the DropDown method in a Visual Basic for Applications procedure to display the list of a ComboBox, you may receive the following error message:

   This program has performed an illegal operation and will be shut down.
   If the problem persists, contact the program vendor.

If you click Details, an error message similar to the following appears:

   EXCEL caused an invalid page fault in module FM20.DLL at
   0137:600390a2.

and Microsoft Excel quits.

CAUSE

This problem occurs when the following conditions are true:

You have a Visual Basic procedure attached to the Click event or the Change event of a ComboBox control in a UserForm.
- and -
The Visual Basic procedure attempts to set the focus to, and then display the list of another ComboBox control on the UserForm.

WORKAROUND

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact the Microsoft fee-based consulting line at (800) 936-5200. For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

   http://www.microsoft.com/support/supportnet/refguide/

The following example illustrates how to display the list of one ComboBox control when you make a choice in the list of another ComboBox control on a UserForm.

Populating the ListBox Directly from Worksheet Cells

 1. Close and save any open workbooks. Then, open a new workbook.

 2. On Sheet1, enter the following values:

       A1: Planes        C1: Alpha
       A2: Trains        C2: Bravo
       A3: Automobiles   C3: Charlie

 3. Start the Visual Basic Editor, (press ALT+F11).

 4. If the Properties window is not visible, click Properties on the
    View menu (or press F4).

 5. On the Insert menu, click Module.

 6. In the code window for the module, type the following procedure:

       Sub DropDown_ComboBox()
           UserForm1.ComboBox2.DropDown
       End Sub

 7. On the Insert menu, click UserForm.

 8. Draw a ComboBox control on the UserForm.

 9. Change the following properties of the ComboBox control to the
    following values:

       Property          Value
       ------------------------------
       RowSource         Sheet1!A1:A3

10. Double-click the ComboBox to open the code window for

    the ComboBox.

11. In the module, type the following code for the ComboBox

    Click event:

       Private Sub ComboBox1_Click()
           Application.OnTime Now, "DropDown_ComboBox"
       End Sub

12. Draw another ComboBox control on the UserForm.

13. Change the following properties of the ComboBox control to the

    following values:

       Property          Value
       ------------------------------
       RowSource         Sheet1!C1:C3

14. Run the UserForm.

When you click an item in the list of ComboBox1, the list for ComboBox2 is automatically displayed.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

REFERENCES

For more information about using the ComboBox control, click the Office Assistant in the Visual Basic Editor, type "combobox control" (without quotation marks), click Search, and then click to view the "ComboBox Control" topic.

For more information about using the DropDown method, click the Office Assistant in the Visual Basic Editor, type "dropdown method" (without quotation marks), click Search, and then click to view the "DropDown Method" topic.

NOTE: If the Assistant is hidden, click the Office Assistant button on the Standard toolbar. If Microsoft Excel Help is not installed on your computer, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q120802
   TITLE     : Office: How to Add/Remove a Single Office Program or
               Component

Additional query words: 97 XL97 combo box drop down ipf 014f:600390a2

Keywords          : kberrmsg kbprg kbui kbdta KbVBA 
Version           : WINDOWS:97
Platform          : WINDOWS
Issue type        : kbbug

Last Reviewed: May 18, 1999