What's winc ? Have you tried using WinspectorSpy to find the window information ? It's probably embbeding the wrong window with the same title.. if you use winspectorspy, you should be able to set the window title (search string) in this format:
For instance, the AVS window of winamp is set using:
This specifies both the class name and window title to prevent embbeding of the wrong window, so you should be able to embbed the correct window ....