By default the controls added to the Ribbon are left aligned in ribbon tab area. If you want to add controls that are right aligned set following attached property:

<dc:RibbonTabPanel.PanelAlignment="Right">

On the control you wish to right align. See RibbonPad sample for an example. Setting that property for example on ButtonDropDown control will right-align the button in the tab area. Screenshot below shows the Help button which has this attached property set:

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