openscales如何调用瓦片地图服务

源代码如下：
<os:Map id="main_map" width="100%"   height="100%" minHeight="200"  zoom="5" centerLonLat="145.80, 84.55">

      <os:WMSC 
        id="google"
        name="test"
        url= "**http://tdt.mwr.gov.cn:81/img_c/wmts**" 
        layers= "XX" 
        isBaseLayer= "true" 
        visible= "true"
        projection = "EPSG:4326" 
        proxy= "null"/>

                </os:Map>

                请问高手们，openscales如何调用wmts服务？