Problem with VS 2003 user created controls in VS 2005 RC1

When I add my old VS 2003 user controls to the ToolBox in VS2005 RC1 and then try to drag one of the controls onto my Windows Form, I'm receiving:
Failed to create component "(My control created and used in VS2003)". The error message follows:
'System.NullReferenceException: Object reference not set to an instance of an object.
at System.Reflection.Assembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.Search(String fullname, String typeName, Boolean ignoreTypeCase, Assembly& assembly, String description)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.SearchNormalEntries(AssemblyName assemblyName, String typeName, Boolean ignoreTypeCase, Assembly& assembly)
at Microsoft.VisualStudio.Design.VSTypeResolutionService.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, ReferenceType refType)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name)
at System.Drawing.Design.ToolboxItem.GetType(IDesignerHost host, Assemb..."
(The callstack kinda trails off there at the end, I'm afraid)
Is there something new and cool we need to do in order to have our old C# gui controls support the new Toolbox environment? Any help here would definitely be appreciated.
EDIT: Ops, I just noticed that this was probably posted in the wrong Forum...Sorry.
[1636 byte] By [SwitzMan] at [2008-2-13]
# 1

Yes, this forum is for discussing Class Designer issues. You may want to try the Winforms forum.

Thanks,
Ramesh Rajagopal.
Class Designer Team.

RameshRajagopal at 2007-9-9 > top of Msdn Tech,Visual Studio,Visual Studio Class Designer...

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