BUG: Control Repaint Problems When ClipControls Set to False

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0
• Microsoft Visual Basic Control Creation, Learning, Professional, and Enterprise Editions for Windows, version 5.0

SYMPTOMS

Clicking on an application's icon on the operating system's taskbar causes some controls to disappear.

CAUSE

This problem occurs when a modal form is displayed while a second form in this application is visible in the background and the background form consists of all of the following:

1. Its "ClipControls" property is set to "False."



2. The controls not displaying correctly are child controls of another control rather than placed directly on the form (such as option buttons within a Frame control).

RESOLUTION

There are two potential workarounds for this issue:

• Avoid setting ClipControls to False when a second modal form will be displayed.



• Leave the ClipControls property set to False but only display non-modal forms.

STATUS

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

MORE INFORMATION

The following example uses a Frame with OptionButtons to demonstrate this behavior.

Steps To Reproduce

1. Create a Standard EXE project in Visual Basic. Form1 is created by default.



2. Add a Frame Control to Form1.



3. Place an OptionButton within the Frame.



4. Place an OptionButton directly on the form.



5. Set the form's "ClipControls" property to "False."



6. Add a CommandButton to Form1.



7. Paste the following code into Form1's code window:

   
          Private Sub Command1_Click()
             Form2.Show vbModal
          End Sub
    




8. From the Project menu, add a second form, Form2, to the Project.



9. Run the Project.



10. Click the CommandButton.



11. Position the forms such that they are both visible.



12. Click the Win95/Win98/NT4 Taskbar item labeled "Form1." Note that the OptionButton within the Frame control disappears. The OptionButton and CommandButton located directly on Form1 continue to display correctly.

Additional query words: paint

Keywords : kbCtrl kbVBp kbVBp500bug kbVBp600bug kbGrpVB
Version : WINDOWS:5.0,6.0
Platform : WINDOWS
Issue type : kbbug