IMS中Java viewer缩放到要素问题zoomtoselection

<P><BR>ArcIMS中的imsMap.zoomToSelection怎么用.. <BR>也就是缩放到选中要素</P>
<P>下面是自带的例子</P>
<P>var imsMap = parent.mapFrame.IMSMap;<BR>imsMap.zoomToSelection(“Cities”, “POPULATION > 9000000”);</P>
<P>我怎么用都不能实现/请指点</P>