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 SUB ctlname_DropDown ([Index AS INTEGER])
 
 Usage Note
   ■ Use a DropDown event procedure to make final updates to a combo box list
     before the user makes a selection. With this procedure, you can add or
     remove items from the list using the ADDITEM or REMOVEITEM methods. Such
     flexibility is useful in cases where you want some interaction between
     controls ─ for example, when what you want to load into a combo box list
     is based on the user's selection in an option button group.