Q187633: BUG: Type Mismatch Referencing UserControl on Unloaded Form

Article: Q187633
Product(s): Microsoft Visual Basic for Windows
Version(s): 
Operating System(s): 
Keyword(s): kbGrpDSVB
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 
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SYMPTOMS
========

If you attempt to set an object variable referencing a UserControl on an
unloaded form, and the UserControl resides in the same project as the Module
containing the declaration, a TypeMismatch error occurs. This problem does not
occur if the form is loaded, if the UserControl is in a different project, or if
the code is placed in the Load Event of the Form containing the UserControl.

RESOLUTION
==========

- Load the Form before referencing the UserControl. For example:

        Sub Main()
           Load Form1
           Dim ctlMyControl as UserControl1
           Set ctlMyControl = Form1.UserControl11
        End Sub

-or-

- Place the UserControl in a different project.

-or-

- Move the code to the Load Event of the Form containing the UserControl.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. We are researching this bug and will post new
information here in the Microsoft Knowledge Base as it becomes available.

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

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

1. Start a new Standard EXE project in Visual Basic. Form1 is created by
  default.

2. From the Project menu, add a UserControl to the project.

3. Close the UserControl window, and add the UserControl to Form1.

4. From the Project menu, add a Module to the project.

5. Insert the following code into Module1:

        Sub Main()
           Dim ctlMyControl as UserControl1
           Set ctlMyControl = Form1.UserControl1
        End Sub

6. From the Project menu, chose Project1 Properties, and change the Startup
  Object to SubMain.

7. Run the project, and note that you receive the "Type Mismatch" error at this
  point.

Additional query words: kbDSupport kbDSD kbVBp500Bug kbNoKeyWord kbVBp600bug

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Keywords          : kbGrpDSVB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600
Issue type        : kbbug

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