o:Gotfocus( hCtrlLost ) -> < nil | bReturn >
------------------------------------------------------------------------------


 PARAMETER:

  <hCtrlLost>  Is the handle of the control that looses the input
               focus


 RETURNS:

  < nil | bReturn>  If the action block ::bGotFocus is defined,
  then this method will return what the codeblock returns, otherwise, it
  will return nil.


 DESCRIPTION:

  If the eventhandler of a window receives a WM_SETFOCUS message, it 
  calls this method of the first control in turn. This sets the input Focus
  to our control, which then evaluates the ::bGotFocus codeblock. 

  This will allow you to perform certain actions when the control gets 
  activated.