IE8/9: Select more doesn't work in Ajax Viewer

[hubu]

Steps: 1. Open one BWL by IE9 beta or IE8. 2. Right-click -> Select More -> Select radius -> Draw Circle

Results: Circle was not drawn but objects selected.

Expected results: It should work as other browsers.

Note1: Select polygon doesn't work either.

Note2: We are using wz_jsgraphics.js to draw circle and polygon.