Dissapearing radiobutton on Windows Classic theme

my application has standard controls - textboxes, statics, and a 开发者_C百科few option buttons (radio buttons). When windows theme (XP) is set to "Classic", and user presses TAB on the form, radio buttons disappear, that is, they are not drawn. Dragging something over my window redraws them.

Any ideas?

I will quote your own answer here Marin, so that the question no longer appears to have zero solutions, hope you dont mind :)

Quote:

resolved, frame had empty spaces as text, and windows misbehaves on classic theme in this case. – Marin yesterday