Hi Alex,
Thanks for Choosing Syncfusion Products.
XAML Reader and XAML Writer is not capable to generate the entire XAML content for DockingManager instance. Because Visual and Logical tree for DockingManager is considerably large. Please use default state persistence logic that already in DockingManager. Here is link for our Online Documentation about State Persistence in DockingManager.
http://help.syncfusion.com/ug_73/toolswpf/HowToSetStatePersistenceForDockingManagerControl.htmlPlease let us know if you have any questions,
Regards,
HemanthKumar K.