I am trying to create a C++ Windows Form Application that contains managed
and unmanaged code.  My problem is not with the mixed code, but with my User
Controls and the Visual Studio 2005 IDE.  After I change the Common Language
Runtime support compiler option from /clr:pure to /clr (necessary for mixed
code), I can not open any Windows Form that contains a User Control in the
Visual Studio 2005 IDE.

To create the test project:

•  Create a C++ Windows Form Application project named ‘Mixed’.
•  Add a User Control to the project named ‘UserCtrl’.
•  Add a button to the new User Control.
•  Save and build the project.
•  Open Form1.h [Design].  From the Toolbox, add the ‘UserCtrl’ User Control
to Form1.
•  Add #include "UserCtrl.h" to Form1.h.
•  Save and build the project.
•  Close all open code windows in Visual Studio.
•  Open the Form1.h [Design] file, it will open and display the Form with
the User Control.  

To create the problem:

•  Close all open code windows in Visual Studio.
•  Change the compiler option from /clr:pure to /clr.  
•  Clean the solution, and then build it.
•  Open the Form1.h [Design] file, Visual Studio will display an error.  

When I try to open the Form in design mode I get the error:

Could not find type 'Mixed.UserCtrl'. Please make sure that the assembly
that contains this type is referenced. If this type is a part of your
development project, make sure that the project has been successfully built.  

The variable 'userCtrl1' is either undeclared or was never assigned.

at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink)
at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager
manager, String name, CodeExpression expression)
at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager
manager, String name, CodeExpression expression)
at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)

If I change the compiler option back to /clr:pure and rebuild the project, I
can successfully open the Form1 Form in the IDE.  With either compiler
option, I can always successfully build and run the code.  However, once I
change to /clr, I can not open my Windows Forms that contain User Controls in
the IDE.  

I have tried recompiles, deleting my ncb file, adding various directories to
my PATH, recreating the controls, check variables exist with namespace,
restarting VS, nothing seems to help.  Any ideas on how to fix this problem?