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 METHOD FocusNext CLASS TWindow   Changes the child focus to the next or to the previous
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   TWindow:FocusNext( <hCtrl>, <lPrevious> ) --> nil

   <hCtrl>      It is the hWnd of the control currently focused.

   <lPrevious>  It is a logical value: .t. for the next and .f. for the
                previous.

   This method sets the focused child control of the window to the next one
   or to the previous according to lPrevious value.