>I put a checkbox in the column of a grid, which is held on a page frame. when I enter the page which holds the grid for the first time, everything looks ok. if I switch pages to another page, and then go back to the grid page, it has lost the check box and displays the value on the table "1" or "0".
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>Your help would be much appreciated.

When you go back to the grid page, do you refresh/rebuild the cursor that underlies the grid? If so, you will need to reset all of the grid/column properties.