Knowledge Base

FIX: MDI Child Windows Control Box Affected by Parent Toolbars

Article ID: 154518

Article Last Modified on 7/15/2004

APPLIES TO

This article was previously published under Q154518

SYMPTOMS

Placing a Windows Common Control's Toolbar on an MDI Parent form affects the functionality of the Control Box on MDI Child windows under Windows NT 3.51. Under normal circumstances, double-clicking a Control Box closes a window as if the user had clicked once to drop down the menu and then selected "Close." When the Toolbar is placed on a Parent window under Windows NT 3.51, double-clicking the Control Box drops the menu but doesn't dismiss the window.

This problem does not occur with Visual Basic under Windows 2000, Windows NT version 4.0, Windows 95, Windows 98, or Windows Me.

RESOLUTION

If you add a PictureBox control to the Form, and Cut and Paste the Toolbar onto the PictureBox, the problem is resolved. When you run the code after doing this, the Control Box behaves in the expected manner.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.
This problem was corrected in Windows 2000.

MORE INFORMATION

Steps to Reproduce Problem

  1. Start a new project in Visual Basic. Form1 is created by default.
  2. Set the MDIChild property of Form1 to TRUE.
  3. From the Insert menu, choose MDI Form.
  4. Add a Toolbar Control to the MDI Form. No images or buttons are required to show the problem.
  5. Press the F5 key to start the project.
  6. Maximize the Child Window.
  7. Double-click the Control Box of the Child Window. The menu should drop down, but the window is not dismissed.

REFERENCES

The Visual Basic Programmer's Guide, Chapter 14.

Keywords: kbbug kbfix kbcontrol KB154518


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