Problem:
Only, if the XP style (Visual style) is enabled on a Vista or XP windows:
When Visual Studio is used to create a WinForms application, the painter shows the objects like push button in Visual XP style, e.g. with round edges.
When running the application, the old standard style is used.
Resolution:
The Visual Style has to be enabled, e.g. by adding an invoke to "EnableVisualStyles" in the "main" method of the application:
set mainForm to Class-Main-Form::"New"()
invoke S-Windows-Forms-Application::"EnableVisualStyles" *> added
invoke S-Windows-Forms-Application::"Run"(mainForm)