Thank you for contacting us.
We looked over the code snippets you sent to us and we are not sure what the Button with Command="Open"
is supposed to do. If you want to implement a built-in command from docking you need to use the telerik:RadDockingCommands
attached property but if you want to use a custom command you should implement
it and then bind the Command property to it.
If you have any other questions do not hesitate to write to us again.
the Telerik team