def SetSelected( self, node, point=None, propagate=True ):
        """Set the given node selected in the square-map"""
        if node == self.selectedNode:
            return
        self.selectedNode = node
        self.UpdateDrawing()
        if node:
            wx.PostEvent( self, SquareSelectionEvent( node=node, point=point, map=self ) )
Set the given node selected in the square-map