bDropOver                    Exported, Block, User
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   This codeblock is called whenever files are dropped over a control ( or
   this Window ). On evaluation bDropOver receives four parameters:

          uDropInfo  Item that was previously saved with SetDropInfo( x )
                     This can be used as some kind of Cargo to the receiver.
                     uDropInfo is a static var in the Window module.

          nRow       The row (in pixels) where the file(s) were dropped

          nCol       The column (in pixels) where the file(s) were dropped

          nKeyFlags  Keyboard status

          please press  Related Topics:  and select  WM_BUTTON  for
          detailed informations about the parameters