Create a Legend control is to bind a chart to it by using the dataProvider property

          

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<!-- charts/LegendNamedSeries.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        import mx.collections.ArrayCollection; 
        [Bindable] public var expenses:ArrayCollection = new ArrayCollection([ 
           {Expense:"Taxes",Amount:2000, Cost:321,Discount:131}, 
           {Expense:"Rent", Amount:1000, Cost:95, Discount:313}, 
           {Expense:"Bills", Amount:100, Cost:478,Discount:841} ]);
    </mx:Script>
    <mx:Panel title="Bar Chart with Legend">
        <mx:BarChart id="myChart" dataProvider="{expenses}">
            <mx:verticalAxis>
                <mx:CategoryAxis dataProvider="{expenses}"
                    categoryField="Expense" />
            </mx:verticalAxis>
            <mx:series>
                <mx:BarSeries xField="Amount" displayName="Amount (in $USD)" />
                <mx:BarSeries xField="Cost" displayName="Cost (in $USD)" />
                <mx:BarSeries xField="Discount"
                    displayName="Discount (in $USD)" />
            </mx:series>
        </mx:BarChart>
        <mx:Legend dataProvider="{myChart}" />
    </mx:Panel>
</mx:Application>

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Create a Legend control is to bind a chart to it by using the dataProvider property : dataProvider « Data Model « Flex

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