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 Erase Background of control
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   Syntax: EraseBkGnd( <hDC> ) --> <nuVal> 

   Parameters:

   <hDC> The 'window' handle of the control for which the background
   should be erased (read: repainted).

   Returns:
   The result depends on the fact if a control has a TBrush() object
   associated to it or not. If it has a TBrush() object associated to
   it, the return value will be 1. Otherwise the return value will be
   Nil.

   Comments:
   The EraseBkGnd() method is normally called by the eventhandler
   automatically whenever needed. However you can call it yourself if
   you want to repaint the background of a control. If you want to do
   this you should pass the ::hDC instance variable of the particular
   control as parameter for the EraseBkGnd() method.