Q145619: FIX: Maximized Win95 MDI Child Form Disappears

Article: Q145619
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:4.0
Operating System(s): 
Keyword(s): kbVBp400bug kbVBp500bug kbOSWin98fix kbGrpDSVB kbDSupport
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 
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SYMPTOMS
========

Under certain circumstances, a maximized MDI child form is invisible and cannot
be made visible. The problem occurs under Windows 95, Windows NT 4.0, and
Windows 2000 when using the 32-bit version of Visual Basic 4.0.

RESOLUTION
==========

When the MaxButton property of Form1 is set to True, the problem does not occur.

STATUS
======

Microsoft has confirmed this to be an issue in Microsoft Windows 95, Windows NT
4.0, and Windows 2000. This problem has been fixed in Microsoft Windows 98.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Start Visual Basic 4.0, 32-bit. If it is already running, click New Project
  on the File menu.

2. Use the Insert/MDI Form menu option to add an MDIForm to the project.

3. In the Design Environment Property window, set the following properties for
  Form1:

  MinButton = False
  MaxButton = False
  ControlBox = False
  MDIChild = True
  WindowState = 2 - Maximized
  Caption =
  Borderstyle = 0 - None 'Options 1 - 5 will also work.

4. Run the application. Form1 will not be visible.

Workaround
----------

1. Start Visual Basic 4.0, 32-bit. If it is already running, click New Project
  on the File menu.

2. Use the Insert/MDI Form menu option to add an MDIForm to the project.

3. In the Design Environment Property window, set the following properties for
  Form1:

  MinButton = False MaxButton = False ControlBox = False MDIChild = True
  WindowState = 0 - Normal Caption = Borderstyle = 0 - None 'Options 1 - 5 will
  also work.

4. In the General Declaration section of Form1, paste the following:

               Private Sub Form_Load()
           'You could copy the following 4 lines to the Resize
           'event of MDIForm1 as well for best results.
           Form1.Top = 0
                   Form1.Left = 0
           Form1.Width = MDIForm1.Width - 185
           Form1.Height = MDIForm1.Height - 470
               End Sub

5. Run the application. Form1 will be visible.

Additional query words:

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Keywords          : kbVBp400bug kbVBp500bug kbOSWin98fix kbGrpDSVB kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbVB400Search kbVB400
Version           : WINDOWS:4.0
Issue type        : kbbug
Solution Type     : kbfix

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