I am working on a silverlight project using the RadGridView and the GridViewSelectColumn in quite a few places. It seems that there is some sort of lag in the initialization which allows for the occasional occurrence of the attached error. I found it is readily reproducible, by quickly dragging one of our GridViewSelectColumn headers to the grouping area. Is this a known issue? Is there any easy way to prevent this from happening? Any help would be greatly appreciated.

Thanks,
Dallas

I tried to replicate you problem, but with no avail. Can you please share with us the source code you are currently using?  In addition to this you can send us a small application where we can see the complete source code and to provide you with an appropriate solution. Any additional information will be highly appreciated as well.