Gets or sets the position of ribbon pages that belong to this RibbonPageCategoryBase within a merged Ribbon. This is a dependency property.
When two RibbonControls merge, pages that belong page categories with lower MergeOrder property values will be arranged before pages that belong to categories with higher merge orders. Also, you can re-arrange individual pages by modifying their RibbonPage.MergeOrder properties.
See the MDI Bar Merging article to learn more.