         "rgb(#{r}, #{g}, #{b})"
       @_tooltipEnabled = true
       @_zoomEnabled = true
+      @_tooltipPlugin = d3.tip()
 
       # initial processing of data
       @console.time('augment')

      @

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

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

