[flexcoders] multiple axis question.

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I'm have a chart with 3 sets of line graph data, id like to have 2 of
those set to have the same y axis, and the third to have its own. The
docs don't really do a good job of explaining this. Can anyone help

sample code

<mx:Panel title="Multiple Data Series" width="100%" height="100%">
      <mx:LineChart id="myChart"
         dataProvider="{srv.lastResult.root.consump}"
         showDataTips="true"
         height="100%"
         width="100%"
      >
         <mx:horizontalAxis>
            <mx:CategoryAxis id="dateAxis" categoryField="date"/>
         </mx:horizontalAxis>


         <mx:verticalAxis>
             <mx:CategoryAxis id="priceAxis" />
         </mx:verticalAxis>

         <mx:verticalAxisRenderers>
             <!--<mx:AxisRenderer placement="left" axis="{kWAxis}"/>-->
             <mx:AxisRenderer placement="left" axis="{priceAxis}"/>
         </mx:verticalAxisRenderers>

         <mx:series>
            <mx:LineSeries id="consump"
                    xField="date"
                 yField="value"
                 displayName="Consumption (kWh) "
            >
            </mx:LineSeries>
           <mx:LineSeries id="cbl"
                 dataProvider="{srv.lastResult.root.cbl}"
                 xField="cbldate"
                 yField="cblval"
                 displayName="CBL"
            >
            </mx:LineSeries>
            <mx:LineSeries id="price" verticalAxis="{priceAxis}"
                 dataProvider="{srv.lastResult.root.price}"
                 xField="pricedate"
                 yField="priceval"
                 displayName="Price ($kWh)"
            >
            </mx:LineSeries>
         </mx:series>
      </mx:LineChart>
      <mx:Legend dataProvider="{myChart}"/>
   </mx:Panel>