Simple Flex Chart question - Plot Chart labels

Question

I'm playing around with displaying data from WDA as charts in Flex 3.
I'm able to bind my internal table, which has 3 fields, to the plot chart.
The table looks like this
ext_id      type string    " bound to prjname in Flex
cost         type string    " bound to prjcost in Flex
benefit     type string    " bound to prjbenefit in Flex
These are all bound to my island's DataSource.
I have bound these in Flex and the Cost and Benefits are showing up as points on my chart. However, I can't seem to get the Project Name to display on the plot points. All I see when I mouse over the point is EXT_ID, and the values for cost and benefits.
The cost/benefit values are coming across correctly, just not the project name (ext_id) value. any ideas?
here's the Flex code for the chart
     [Bindable]
     public var dataSource:ArrayCollection;
     [Bindable]
     public var prjcost:String;
     [Bindable]
     public var prjbenefit:String;
     [Bindable]
     public var prjname:String;.
    <mx:PlotChart id="plotchart1" dataProvider="{dataSource}" showDataTips="true">
       <mx:series>
            <mx:PlotSeries displayName="{prjname}" yField="{prjcost}" xField="{prjbenefit}" dataProvider="/>
        </mx:series>
    </mx:PlotChart>

Answer 1

This is really a Flex question not an Islands specific one.  I don't think the displayName properity is what you want to use here.  This is the name for the entire series as it will be displayed in the legend. I think what you want is a dataTip.  You register a callback for the dataTip rendering and then fill the custom dataTip quick info.
This is an example from a bar chart, but the theory is the same:
<mx:BarChart id="barChart" dataTipFunction="dtFunc" xmlns:mx="http://www.adobe.com/2006/mxml" type="clustered" width="100%" showDataTips="true" height="100%">
     <mx:verticalAxis>
          <mx:CategoryAxis categoryField="{SalesOrd}" dataProvider="{dataSource}" />
     </mx:verticalAxis>
     <mx:series>
          <mx:BarSeries id="bsGross" xField="{grossAmt}" displayName="Gross Amount" dataProvider="{dataSource}" fill="{otdFill}" showDataEffect="{slideIn}"  />
          <mx:BarSeries id="bsNet" xField="{netAmt}" displayName="Net Amount" dataProvider="{dataSource}" fill="{rtyFill}" showDataEffect="{zoomIn}"  />          
     </mx:series>
</mx:BarChart>
private function dtFunc(hd:HitData):String {
              switch(BarSeries(hd.element).id){
                   case "bsGross":
                         return "Sales Order #: " +  hd.item.SO_ID + "\n" + FlashIsland.formatNumber(hd.item.TTL_GROSS_AMOUNT) + " " + hd.item.CURRENCY_CODE;                        
                         break;
                   case "bsNet":
                         return "Sales Order #: " +  hd.item.SO_ID + "\n " + FlashIsland.formatNumber(hd.item.TTL_NET_AMOUNT) + " " + hd.item.CURRENCY_CODE;
                         break;                   
              return "Amount";