XL98: System Error Using DropDown Method with ComboBox

• Microsoft Excel 98 Macintosh Edition

SYMPTOMS

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

   The application "Microsoft Excel" has unexpectedly quit, because an
   error of type 1 occurred.

   You should save your work in other open applications and restart the
   computer.

    -or-

   Sorry, a system error occurred.
   "Microsoft Excel"
    error type 11

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 engineers 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/default.asp

  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 OPTION+F11).

  4. On the Insert menu, click Module.

  5. In the Code window for the module, type the following procedure:

        Sub DropDown_ComboBox()
            UserForm1.ComboBox2.DropDown
        End Sub

  6. On the Insert menu, click UserForm.

  7. Draw two ComboBox controls on the UserForm.

  8. Double-click the UserForm to open the Code window for the UserForm.

  9. In the module, type the following code:

       Private Sub UserForm_Initialize()

          ' Populate ComboBox1.
          ComboBox1.List = Worksheets("Sheet1").Range("A1:A3").Value

          ' Populate ComboBox2.
          ComboBox2.List = Worksheets("Sheet1").Range("C1:C3").Value
       End Sub

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

 10. Run the UserForm.

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 the 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 the 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 Help is not installed on your computer, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q179216
   TITLE     : OFF98: How to Use the Microsoft Office Installer Program