Editing Bitmaps

Hi friends,
When I edit bitmaps in the bitmap editor of VC++ 6.0 I encounter this problem. When the width of the bitmap goes beyond 832 pixels all the pixels beyond 832 appear black in colour, and i am not able to edit it. Is there a work around?
Thanks and regards,
Latha
[294 byte] By [Latha] at [2007-11-15 22:14:42]