Hi Paul Bradford,
The groups should indeed be available in the Grouped event but it seems that this is not the case. We have logged this issue and will fix it as soon as possible.
We have done some changes to our Items collection and in our future builds Items will return flat collection no matter if the grid is grouped or not - this will remove the need to use FlatItems extension. Items will also expose a property called Groups which will provide access to the groups.
For the time being you can use Dispatcher to get the items after they have been updated:
sender, GridViewGroupedEventArgs e)
var flatItems =
Thank you for your feedback and cooperation. I have updated your Telerik points.
the Telerik team
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