Use categoryField property to point to the field in the data provider that contains the labels for the axis

           
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<!-- charts/BasicColumn.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        import mx.collections.ArrayCollection;
        [Bindable]
        public var expenses:ArrayCollection = new ArrayCollection([
            {Month:"Jan", Profit:2000, Expenses:1500},
            {Month:"Feb", Profit:1000, Expenses:200},
            {Month:"Mar", Profit:1500, Expenses:500}
            ]);
      </mx:Script>
    <mx:Panel title="Column Chart">
        <mx:ColumnChart id="myChart" dataProvider="{expenses}">
            <mx:horizontalAxis>
                <mx:CategoryAxis dataProvider="{expenses}"
                    categoryField="Month" />
            </mx:horizontalAxis>
            <mx:series>
                <mx:ColumnSeries xField="Month" yField="Profit"
                    displayName="Profit" />
                <mx:ColumnSeries xField="Month" yField="Expenses"
                    displayName="Expenses" />
            </mx:series>
        </mx:ColumnChart>
        <mx:Legend dataProvider="{myChart}" />
    </mx:Panel>
</mx:Application>

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5.	Use the updateDataChild() method to add a label to a single data point on the line

Use categoryField property to point to the field in the data provider that contains the labels for the axis : Label Data « Components « Flex

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