I discovered the problem I was having with ListBoxes. I was trying to have the click event do too much. I was attempting to populate 4 comboboxes. This Was to much for the event handler. So what I do Now is display the last selected items from the 4 Comboboxes in 4 textfields (readonly) instead. If The user wants to change the data in the comboboxes, The comboboxes become populated in the gotfocus event Of the 4 comboboxes.
Eric