       @
 
     _renderTooltip: () ->
-      @tip = d3.tip()
+      @tip = @_tooltipPlugin
         .attr('class', 'd3-tip')
         .html(@tooltip())
         .direction (d) =>

        'zoomEnabled',
        'zoomAction',
        'tooltip',
        'color'])
      @_ancestors = []


        "rgb(#{r}, #{g}, #{b})"
      @_tooltipEnabled = true
      @_zoomEnabled = true
      @_tooltipPlugin = d3.tip()

      # initial processing of data
      @console.time('augment')
