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As you know that a Group has Items property and it's support SortDescriptions.
It means I can change the sorting of it's child items.
But I can't find any property or a function related with sorting at a Tab class even at XAML.
I know that the sequence of add a tab to Tabs is applied to order of tabs to shown on Ribbon.
I want to known how to change the order of tabs on run-time.