在mapxtreme2004中实现面积测量的自定义控件的使用-mapxtreme2004 achieved in the area of measuring the use OCX

实现了openlayer自定义控件，实现前一视图、后一视图、原始视图三个功能按钮(Realize openlayer custom control, the realization of the previous view, the latter view, the original view of the three function buttons)