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Article ID: 312120 - Last Review: January 25, 2006 - Revision: 3.4
BUG: An ActiveX control may disappear from a form in design view in a Visual Studio .NET Windows application
This article was previously published under Q312120
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SYMPTOMS
When you place an ActiveX control that was created in
Visual Basic 6.0 or Visual C++ 6.0 on a form in a Visual Studio .NET Windows
application, the control may disappear from the form in the design view. The
control disappears when you use the
Properties window to set the value of a form property, such as
ShowInTaskBar.
CAUSE
If you set any property of the form (such as
ShowInTaskBar), the form's handle is recreated. Some ActiveX controls hide
their windows when the parent's Hwnd gets a WM_DESTROY message. This sets the
control's
STATE_VISIBLE property to
false inside the property's state bits. When the form's handle is
recreated, the control's handle is not recreated because the control's
STATE_VISIBLE property is set to
false.
RESOLUTION
To work around the problem, you can set the properties in
the
Form_Load event instead of in the
Properties window.
STATUS
Microsoft has confirmed that this is a bug in the Microsoft
products that are listed at the beginning of this article.
MORE INFORMATION
Steps to Reproduce the Behavior
- Use Visual Basic 6.0 to create a UserControl, or use Visual
C++ 6.0 to create an Active Template Library (ATL) or Microsoft Foundation
Classes (MFC) control.
- Register the control on the computer that has Visual Studio
.NET installed.
- Start Visual Studio .NET. Use Visual Basic .NET, Visual C#
.NET, or Visual J# .NET to create a new Windows application. Form1 is created
by default.
- Right-click the Toolbox window, and then
click Customize Toolbox on the shortcut menu.
- Click the COM Components tab. Select the
ActiveX control that you created in step 1 from the list. Click
OK, and the control will appear in the Toolbox.
- Add this control to Form1.
- In the Properties window, change the value
of the Form1 ShowInTaskBar property.
The ActiveX control disappears from the form
immediately.
APPLIES TO
- Microsoft .NET Framework 1.0
- Microsoft Visual Basic .NET 2002 Standard Edition
- Microsoft Visual C# .NET 2002 Standard Edition
- Microsoft Visual J# .NET 2003 Standard Edition
| kbvs2005doesnotapply kbvs2005swept kbtshoot kbvs2002sp1sweep kbbug kbpending kbreadme KB312120 |
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