Hi everybody, I want to customize group header appearance defining a GroupConfiguration item  in window resource and passing this item to ''OrderID'' column on OnApplyTemplate method . To do this I wrote this XAML: <Window> <Window.Resources> <!--DataGridCollectionViewSource-->   ...

GroupLevelDescriptions provide complementary information to the GroupDescriptions that are used to group that data items. That said, if you want to add group descriptions at runtime, you would need to add them to either the Items.GroupDescriptions collection (see ItemsControl), or to the DataGridCollectionView[Source] to which the grid is bound.