We have discovered a problem in RadGrid design-time support in the Q1 2013 SP1 release. When you customize RadGrid using designer, the control will generate ColumnSettings="(Collection)" in the markup which will cause an exception.
The solution is to simply remove the markup shown above which will allow you to use the designer again.
Please excuse us for any inconvenience caused.
6 Answers, 1 is accepted
Seriously Telerik, there are so many problem with the Q1 2013 release.
ColumnSettings="(Collection)" is appearing as soon as make any change on RadGrid via designer. However, this issue will be fixed in our next official release 2013 Q1 SP2, which will be released this week.
the Telerik team
We've just bought, and not terribly pleased that first attempts to use fail because of bugs in your system :(