XL97: Illegal Operation Using Unload with Enter Event

• Microsoft Excel 97 for Windows

SYMPTOMS

When you display a UserForm in Microsoft Excel 97, 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
   0137:60007585.

CAUSE

This problem may occur when all of the following conditions are true:

• You create a control on the UserForm and attach code to the Enter event.

  -and-

• The code that is attached to the Enter event for the control uses the Unload statement.

  -and-

• The control has a TabIndex property of 0 (zero).

WORKAROUND

If you must use the Unload statement in the code that is attached to the Enter event for a control, set the TabIndex property to a value other than zero.

To change the TabIndex property for a control, do the following:

1. Select the control on the UserForm.

2. If the Properties window is not visible, click Properties Window on the View menu.

3. In the Properties window, scroll until you see the TabIndex property and type a number other than zero for the property.

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.

MORE INFORMATION

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.

Because the Enter event occurs before the focus moves to a particular control, you can use an Enter event procedure to display instructions; for example, you can use a macro or event procedure to display a small form or message box that identifies the type of data the control contains.

The Exit event is similar to the Enter event. However, the order in which these two events are triggered differs. For example, if you select a check box that initiates the Enter event, and you then select another control in the same form, the Exit event is initiated for the check box, and the Enter event occurs for the second control on the form.

To prevent a control from losing focus, set the Cancel argument of the Exit event to a value of True. For example, if you create a command button called CommandButton1 on your UserForm, you can use the following code for the Exit event:

   Private Sub CommandButton1_Exit (ByVal Cancel As MSForms.ReturnBoolean)
       Cancel = True
   End Sub

REFERENCES

For more information about the Enter and Exit evens, click the Index tab in Microsoft Visual Basic Help, type the following text

   enter