<P>用FeatureFactory 创建的图元是独立图元，这种图元怎么更新啊？例如改变他的位置。望高手赐教部分代码如下：</P>
<P>CMapXFeatureFactory cFactory=m_ctrlMapX.GetFeatureFactory();</P>
<P>CMapXFeature feature=cFactory.CreateSymbol(vtPoint,vtstyle);
layer.AddFeature(feature);</P>
<P>不能用feature.Update();</P>
