I have in my application many "codeboxes." This is a textbox where a user enters a code that corresponds to a table of codes and values. RightClicking on such a codebox brings up a ListBox of acceptable values. The ListBox is removed in its Valid or LostFocus Event. A problem arises when the user doesn't want to select a value and just wants to close the ListBox. Clicking on just any part of the form won't work because the ListBox can only lose focus if another object gets the focus. Hitting the ESC key, which might seem natural, also won't close it. Any suggestions?

Thanks
Elyse