I think I know what the problem is. When I put any control inside a label box, the events to those (child) controls no longer get to them. You can duplicate easily by putting an ArrayCtrl and a Button inside a LabelBox, then the column headers of the ArrayCtrl are no longer resizable and THISBACK(buttonPush) has no effect. Please take a look at this problem to make Ultimate++ the best. I like Ultimate very much. Thanks