FIX: Cannot Drag a Nested UserControl with Automatic DragMode

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0

SYMPTOMS

When you have a nested UserControl whose DragMode is set to Automatic and you attempt to drag the control at run-time, your application may quit unexpectedly or you may receive the following error:

   “Run-time error '-2147417848 (80010108)':
   Method 'DragMode' of object '_UserControl1' Failed”

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 Studio 97 Service Pack 2.

For more information on the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q170365
   TITLE     : INFO: Visual Studio 97 Service Packs - What, Where, and Why

   ARTICLE-ID: Q171554
   TITLE     : INFO: Visual Basic 5.0 Fixes in Visual Studio 97
               Service Pack 2

MORE INFORMATION

Steps to Reproduce Behavior

1. Start a new "Standard EXE" project.

2. Add a UserControl to the project.

3. Set the Backcolor property of the UserControl to &H000000FF& (red) and the Name property to "usrMovable."

4. Resize usrMovable so that it is fairly small.

5. Add the following code to the Click event of the UserControl:

         UserControl.Extender.DragMode = vbAutomatic
   

6. Add another UserControl to the project and set its Name property to "usrHolder."

7. Add an instance of usrMovable to usrHolder.

8. Add an instance of usrHolder to Form1.

9. Run the project.

10. Click usrMovable and then attempt to drag usrMovable. You will either

        receive the error described at the beginning of this article or your
        Visual Basic application will unexpectedly end.
    

Keywords          : vb5all VS97FixlistSP3 VS97FixlistSP2 VB5FixlistSP2
Version           : 5.0
Platform          : WINDOWS
Issue type        : kbbug
Solution Type     : kbfix kbservicepack