How can i change order of the tabs at Ribbon.

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.