XL97: Invalid Page Fault Using DropDown Method with ComboBox

• 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.

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

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 examples of Visual Basic for Applications procedures 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. The Visual Basic procedures in this article are provided 'as is' and Microsoft does not guarantee that they can be used in all situations. While Microsoft support engineers can help explain the functionality of a particular macro, they will not modify these examples to provide added functionality, nor will they help you construct macros to meet your specific needs. If you have limited programming experience, you may want to consult one of the Microsoft Solution Providers. Solution Providers offer a wide range of fee-based services, including creating custom macros. For more information about Microsoft Solution Providers, call Microsoft Customer Information Service at (800) 426-9400.

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.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

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