> ... However, when I click on the checkbox to set its value to true and i
> move to the next column, the check box looses its value (goes back to false).
> Why is this? How can I get this to work right?
>
> If I use a textbox instead of a check box, and I enter the value "T" - true -
> it keeps the value of true when I move the the next column.

My first shot would be pessimistic row-buffering. This field is type logical in the DB? Yes, you said so.