An old problem in the new version (Win2000)?

Hi,

1. Run Geometry sample,
2. Maximize application,
3. Close dialog,
3. Invoke Point from sphere,
4. Restore MDI child window,
5. Change background color of MDI child to green,
6. Minimize - maximize application
or Alt-Tab switch between applications.

Result - the MDI child window has its original background color (gray), the contents is not redrawn.
I met this problem in OC4, hopped it will be solved in OC5.
Is there some way how to go around that?

Best regards,
Adrian