arcengine怎么显示布局控件的标尺？

AO链接：http://resources.arcgis.com/en/help/arcobjects-net/componenthelp/index.html#//0016000002rz000000
有说明
The IActiveView::ShowRuler property will not display any rulers on the PageLayout because the PageLayoutControl does not itself manage rulers. An application must draw its own rulers.