I have a grid control that is working ok in term of data presentation. I am unable to figure out how to validate the diferent entries when the user click on the boolean type columns. I was reading the book .Net for Visual Foxpro programmer and see that they only make reference to one method "validation". Is that the only method that you have to use to validate all the columns in a grid? or you can emulate the click for individual columns like in VFP.