为什么时候在AO中使用IMapControl2 接口会出错?

最近在AO中编程时调用IMapControl2 出错,说不能识别此接口,为什么啊?

<P>因为<STRONG>Available with ArcGIS Engine</STRONG></P>
<P>IMapControl2 Interface (esriControls) </P>
<br>
<p>
<P>Provides access to members that control the MapControl. Note: the IMapControl2 interface has been superseded by IMapControl3. Please consider using the more recent version. </P>
<P>Product Availability</P><STRONG>Available with ArcGIS Engine</STRONG>.