HeaderPersister is a small utility class that persist the header of individual GroupItems while scrolling. It is not tied to any particular ItemsControl derived class, I confirmed a correct behavior for ListBox, ListView and TreeView.

Usage

The usage of the HeaderPersister is straightforward, make sure to:

• Bind to your CollectionViewSource instance and define your GroupDescriptions collection.
• Set the attached property HeaderPersister.IsEnabled to true.
• Duplicate the visual tree of the GroupItem header in the HeaderPersister.HeaderTemplate attached property.

For more information, check the following blog post: http://blog.qarim.net/2013/08/16/wpf-persistent-group-headers-for-the-listbox-control/