<object id="SampleControl1" classid="clsid:A662DA7E-CCB7-4743-B71A-D817F6D575D
<param name="RibbonDisplayMode" value='RibbonNotShown'>
<param name="CanvasToolbarEnabled" value='0'>
I know it is off topic but when I was looking for this problem this was the only place where this problem was mentioned.
For somenone who will search for the answer how to hide Ribbon bar using AutoDesk Design Review 2011 using ActiveX control inside WindowsForms.
I was able to do this be setting _ViewerParams = ?RibbonDisplayMode=RibbonNotShown inside Property window of axCExpressViewerControl