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Give focus to next control in dialog box
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   Syntax: TDialog():FocusNext( <hCtrlFocus>, <lPrevius> ) --> NIL

   Parameters:

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

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

   Comments:
   With the FocusNext() method the programmer can place focus on the
   control that is before (<lPrevius> is .F.) of after (<lPrevius> is .T.)
   the control identified by <hCtrlFocus>.  To get a handle of a certain
   control you could use the GetItem() method to obtain <hctrlFocus>
   (assuming that you DO know the ID of the control), or just use the value
   stored in the ::hWnd instance variable for that specific control