Make sure that the picture cover entirely the header so that the usre cannot click on the grid header. Also, make sure that the picture is in front by clicking on the picture and select "Format|Bring to front".

HTH

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>I tried that, the problem is when you click on the column's header
>it changes its color, at that moment you can not see the bit map
>until you release the finger from the mouse.
>
>How you would over come this probelm ?