I have a panel that is only visible if a user checks a bound checkbox in an edititemtemplate of a formview. I can't get the panel to become visible when I check the bound checkbox. How does one solve this? I'm assuming that the checkbox's checked property is not really true/false because it is bound to a datafield. How do I determine the checkbox's value ("0" is unchecked and "-1" is checked) to make the panel visible?