Progress Telerik UI for WPF
Use nested RadDocking inside other RadDocking instances for even the most complex layout scenarios. This provides multiple DocumentHosts, levels of docking compass restriction and inner Tabs.
The WPF Dock control is equipped with a DockingNavigator UI that significantly simplifies the navigation between all non-hidden panes. With the keyboard shortcuts CTRL+ Tab and ALT+F7 users are now able to navigate through the panes and preview their content.