Please, have a look at the following article - RadDataGrid: Grouping Styling.
At the end of the article, there is an example that shows how to use the GroupHeaderTemplateSelector
. As shown there, the item should be cast as GroupHeaderContext.
Eventually, you can check what properties you can work with according to the scenario you would like to achieve. Here is an example:
item, Windows.UI.Xaml.DependencyObject container)
var groupHeaderContext = item
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