Silverlight Business Application OOB - All content disapears after lost focus

I have an out-of-browser app started from the Silverlight Business Application template. About 1 second after the app launches, all the content inside the application dissapears. The only detail i can give is that in the output window, right before the content dissapears, two assemblies get loaded:

'sllauncher.exe' (Silverlight): Loaded 'C:\Program Files (x86)\Microsoft Silverlight\4.0.60129.0\en-US\System.Windows.debug.resources.dll'
'sllauncher.exe' (Silverlight): Loaded 'C:\Program Files (x86)\Microsoft Silverlight\4.0.60129.开发者_C百科0\en-US\mscorlib.debug.resources.dll'

Does anyone have any idea where this problem can come from?

Thank you

Found the problem, the application was throwing an exception, which was not caught. If i marked the exception as handled in the Application_UnhandledException event, it worked fine.