做Flex柱状图报表时候 参考Demo如下

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        import mx.collections.ArrayCollection;
        [Bindable]
        public var expenses:ArrayCollection = new ArrayCollection([
            {HospitalNo:"1", HospitalName:"Jan", Profit:2000, Expenses:1500},
            {HospitalNo:"2",HospitalName:"Jan", Profit:1000, Expenses:200},
            {HospitalNo:"3",HospitalName:"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="HospitalName" />
            </mx:horizontalAxis>
            <mx:series>
                <mx:ColumnSeries xField="HospitalName" yField="Profit"
                    displayName="Profit" />
                <mx:ColumnSeries xField="HospitalName" yField="Expenses"
                    displayName="Expenses" />
            </mx:series>
        </mx:ColumnChart>
        <mx:Legend dataProvider="{myChart}" />
    </mx:Panel>
</mx:Application>

当x轴绑定的是HospitalName，若HospitalName相同，则在x轴上显示数据有错误，若绑定HospitalNo 则在x轴上显示数字，不符合需求，实在没有想到好的办法，求解！