>have a grid.column that has a checkbox as the control. set the grid to readonly, yet you can still click into the checkbox. the column has readonly = .t. checkbox does not have a readolnly property.
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>also on another form i have the almost an opposite situation. can tab to the checkbox and press enter to change its value, but am not able to click (with the mouse) to change the checkbox value.
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>any ideas?

This happens, and not only with checkboxes. The solution I use is to return, from the checkbox WHEN event, NOT This.READONLY.