Depends how your bitmap is stored. If you have this structure:

BITMAPINFOHEADER bmHeader

it has a member

//LONG biWidth;
LONG width = bmHeader.biWidth

Does the problem only happen on the sheet4 when you click the 'ok' button and it jumps to the Csheet1::onOK() function?

aravind.sn wrote:

... and obviously they all have common "Ok" "Apply" and "Cancel" button.

Also from the above, are you saying that they all share the same buttons ? if that is so then that is the problem !