Form Bitmap

[Ingo Brueckl]

Maybe I'm blind but I can't find functions for what I intend to do in the
documentation.

I have a form bitmap and several bitmap resources. How can I dynamically
change the bitmap resource ID of the from bitmap, so that the bitmap
displayed changes? Before drawing the form, obtaining a BitmapPtr b and
setting b->flags.reserved works, but this surely isn't what I am supposed
to do, is it?

Ingo