The xamRibbon exposes more control over the layout process than was available in the UltraWinToolbars' Ribbon. Instead of exposing a property that controlled whether that one state was acheivable, each RibbonGroup exposes a Variants which is a collection of the GroupVariants that describe the resize action to take place and the priority with respect to the other groups in the same ribbon tab. This allows you to control what resize states will occur and in what order. Note, if you define any Variants for one group you must define them for all the groups in the tab.