bool column in datagrid

okay I have a datagrid which is bound to a datatable. I dynamically created a datagridboolcolumn - everything works fine and the datagrid displays properly - but how do I after set readonly to true for any checkbox that is currently checked? I'm trying to use the click event and evaulate if it is a checkbox field and its value and then just reset the value back to true - but doesn't seem to work. How do I do this - with a customstyle?

Thanks

Okay this was a pain but was able to do this with a delegate and custom event. I created my own datagridboolcolum and used raise event to call a sub where I checked the value and handled it appropriatley.