combox数据绑定

<mx:XML id="dp">
            <league label="American League">
                <division label="East">
                    <team label="Boston" />
                    <team label="New York" />
                    <team label="Toronto" />
                    <team label="Baltimore" />
                    <team label="Tampa Bay" />
                </division>
                <division label="Central">
                    <team label="Cleveland" />
                    <team label="Detroit" />
                    <team label="Minnesota" />
                    <team label="Chicago" />
                    <team label="Kansas City" />
                </division>
                <division label="West">
                    <team label="Los Angeles" />
                    <team label="Seattle" />
                    <team label="Oakland" />
                    <team label="Texas" />
                </division>
            </league>
    </mx:XML>

   <mx:ComboBox id="comboBox" prompt="Please select a team..." dataProvider="{dp.division.team}" labelField="@label">
   </mx:ComboBox>  //dataProvider为数据源