LPARAMETERS button, shift, x, y
LOCAL loNode
*** if we have a shortcut menu associated
*** with this treeview, show it if we right-clicked
*** But only show it if we have actually right-clicked
*** on a node, if we right-click on the '-' or '+' in front
*** of a node, there is not way to select it
IF Button = 2 AND NOT EMPTY( This.cMenu )
  *** Get a reference to the node under the mouse
  loNode = This.HitTest( X * This.nFactorX, Y * This.nFactorY )
  *** If we have a valid node, show the menu.
  IF NOT ISNULL( loNode ) 
    This.ShowMenu()
  ENDIF
ENDIF