FIX: Selecting Invisible Tab Can Cause GPF with SSTab Control (149328)

The information in this article applies to:

Microsoft Visual Basic Standard Edition, 32-bit, for Windows 4.0
Microsoft Visual Basic Professional Edition, 16-bit, for Windows 4.0
Microsoft Visual Basic Professional Edition, 32-bit, for Windows 4.0
Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows 4.0
Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows 4.0

This article was previously published under Q149328

SYMPTOMS

With the SSTab control, switching to a tab that has been previously made invisible can cause application errors or GPFs. In testing these, exceptions were raised in both TABCTL16.OCX and TABCTL32.OCX at these addresses:

   TABCTL16.OCX   0001:00004D88
   TABCTL32.OCX   0137:0578B4E5

This problem may also manifest itself at other addresses on different configurations.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Basic 6.0.

MORE INFORMATION

Steps to Reproduce

Start Visual Basic 4.0. Form1 is created by default.
Add a single SSTab control to the form.

Add this code to the Form_Load event of Form1:

      Private Sub Form_Load()
         SSTab1.TabVisible(0) = False
         SSTab1.Tab = 0
      End Sub

Press F5 or select Start from the Run menu to run the application. An application error or GPF will occur before the form finishes loading. This problem also occurs if an EXE is made and run.

Modification Type:	Major	Last Reviewed:	6/24/2004
Keywords:	kbBug kbfix kbVBp600fix KB149328