No Texts shown for win32 application?

I have done some testing with the demo version of Passolo and noticed that whenever I add a simple application I created myself in C# to a project, Passolo shows none of the localizable strings and none of the dialogs.

The application only consists of a dialog with some labls and buttons.

Is a certain structure required?
Does Passolo just ignore everything as soon as a non-standard library is involved?