I am using a RadHTMLPlaceHolder inside a RadWIndow to bring up a Bing 3D map and it comes up great the first time. But when I return to it, I receive the following error: Only one 3D map can be shown at a time. I tried some different settings and some other things, but I can't get it resolved. The strange thing is that it only happens in Internet Explorer, but in FIrefox it works perfectly. It seems as though IE is caching it somewhere and trying to reuse what is cached. If anyone has a solution to this, I would appreciate the help.