Hi Bill
I was not able to reproduce the problem when I accessed docked controls collection in OnLoad method.
Here is one point for your attention.The Onload method is not a good place to access the docked controls because at that time docking manager will be in initialising all the docked controls.So it is better to access the controls in the NewDockStateEndLoad event handler.This event will get fired only after completing initialisation.
I have created a sample to access docked controls collection.Please change that to meet your problem and resend to me.It will be great help in solving this problem.
Also please refer
this KnowledgeBase article about accessing the collection of docked controls
Thanks for using Syncfusion products
Regards
Joy
dockctrlcollection.zip