For me this is strange. Moreover, you say that you have the same behaviour when you run the online examples. This the first post that say that the examples does not work in IE8. In my IE8 everthing seems to work ok. Also IMHO the reson can lie in the some browser configuration, but I could not
I get a similar error with IE8 when i click in button edit, delete or view without select a row in grid… the dialog alert not show, only blur over the page that go off with mouse click. It's hapen in my grids and too with demos, for exemple in “3.5 – Form Improvements”.
I had the same error saying “Not Implemented”. I don't know if this work around will be good for you and fix your issue but you can give it a try. I did put this meta tag onto my website:
Thanks for the solution. It worked well, but my UI alignement, looks everything got ugly. I think they have to do a fix from their java script library then it will be really good one.