如何在List前面显示图标

[Embed(source='assets/png/Circle.png')] private static var point:Class; [Bindable] [Embed(source='assets/png/Polyline.png')] private static var polyline:Class; [Bindable] [Embed(source='assets/png/Polygon.png')] private static var polygon:Class; private var layerType:ArrayCollection = new ArrayCollection([{label:"点",tp:TableInfo.TableLayerTypePOINT,icon:point}, {label:"线",tp:TableInfo.TableLayerTypeLINE,icon:polyline}, {label:"面",tp:TableInfo.TableLayerTypePOLYGON,icon:polygon}]);