BUG: Selecting Invisible Tab Can Cause GPF with SSTab Control

• Standard, Professional, and Enterprise Editions of Microsoft Visual Basic, 16-bit and 32-bit, for Windows, version 4.0

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

STATUS

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

MORE INFORMATION

Steps to Reproduce

1. Start Visual Basic 4.0. Form1 is created by default.

2. Add a single SSTab control to the form.

3. Add this code to the Form_Load event of Form1:

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

4. 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.