oWin:ncMouseMove( <nHitTestCode>, <nRow>, <nCol> ) -> <nil>

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 PARAMETER:

  <nHitTestCode>   Specifies a constant that specifies the position of the 
                   cursor ( the HT_xxx stuff ). Not interesting for us.

  <nRow>           The current cursor row ( pixel )

  <nCol>           and the cursor col ( in pixel )


 DESCRIPTION:

  This Method is the receiver of a WM_NCMOUSEMOVE message, that is sent 
  to it when its nonclient area is overflown by the mouse.