Unable to load custom plugin when using Qt Creator 2.1 RC with qt-sdk-win-opensource-2010.05.exe

I downloaded and installed Qt Creator 2.1 RC (qtcreator-2.0.94).
I am using it with LGPL Qt SDK (qt-sdk-win-opensource-2010.05.exe)
I created a custom widget plugin (based on the analog clock example)
When I navigate to Tools->Form Editor...->About Qt Designer Plugins and click "refresh" I see that the plugin I created failed because of error:

"The plugin 'C:/Qt/qtcreator-2.0.94/bin/designer/customclockplugin.dll' uses incompatible Qt library. Expected build key "Windows msvc release full-config", got "Windows mingw release full-config".

From what I can gather Qt Creator 2.1 RC is built using msvc and the SDK builds using mingw. Therefore I am unable to create and use my custom plugins.