Hi Bill
I am afraid.Currently there is no method to get docking state as an object and also the splitter information.But you could access each docked window''s dock properties and use that information to store the state of DockingManager.
For more information please refer our online help from this
link
Also please refer
this KB article.
Please let me know if these satisfies your requirement
Thanks for using Syncfusion products
Regards
Joy