Today I got XE2

, I'm very excited

, I quickly started test it.
Yesterday I wrote test app in 2010, a few buttons and one TImage on panel. On image is visible generated bitmap after buttons click.
I opened this app in XE2, nice, working

. Now I enabled style and... empty TImage

- need to dbl call rendering function to make bitmap visible
Delphi-Quellcode:
var
Bitmap: TBitmap;
begin
Bitmap := TBitmap.Create;
try
{ Render here........... }
Image1.Picture.Bitmap.Assign(Bitmap);
finally
Bitmap.Free;
end;
end;
This is very, very, very trivial - in system style image is visible after simgle call, when styles used need to dbl call to see effect. Why? How to fix it?