Thank you for writing.
Regarding your first question, I can confirm that this is an issue and I have logged it in our feedback portal
. You can track its progress, subscribe to status changes and add your vote/comment to it on the following link - feedback item
. I have also updated your Telerik points
. The issue is already in development and a fix will available with our upcoming service pack release.
If I correctly understand your second question, you would like to add a checkbox element in each of the group rows. I am sending you attached a project which I believe should get you going. I also included a workaround for the discussed above issue.
I hope this helps. Should you have further questions please do not hesitate to write back.
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal
and vote to affect the priority of the items