You cannot have two controls with the same names in the Docking control - this is because the panes doesn't create a new name scope and the framework doesn't allow existence of two elements with the same name in the same name scope.
Using the same name scope for the content of all the panes is needed as when defining the panes in the same XAML file and placing names to their children, the framework generates fields for them and we want to keep these fields working correctly.
Hope this information is helpful.
the Telerik team
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