Publishing WPF Site

OK, we (almost) finished the WPF application and wanted to install it.
Nothing simpler than this: right-click -> publish -> choose location -> run XBAP. I wish !!!
it kept telling me desperately that "System.IO.IOException: Cannot locate resource 'app.xaml'."

Some google research lead me to this post. I tried dropping out my custom control and replace it's call with the code itself and it suddenly worked.
Thank you , guys, I was really out of ideas about it !
This is only my part of problems, my budy is struggling with thinks like : missing ADODB on the remote machine, dll not in the GAC, etc

Strange strange world...:)