I decided to debug in an easier way:
I downloaded the souces of Scintilla, and added an object in code. This also cause the VS not to response.
Now I could easily debug the code, and I found that it get stucked at file Scintilla.cs, line 3729
_printing = new Printing(this);
I have proplems with my printer's services, so maybe thats the reason.
I commented out the line and now it works.
alot for your help,