The UserControl cannot be hosted in the RibbonTabItem, by default. So, the UserControl has to be derived from the RibbonControl. The GridGroupingControl has to be created, derived from the RibbonControl, and then hosted as MS Outlook 2013 Ribbon item. The following code example demonstrates the same.
Note : By using the above code, the Syncfusion WF controls can be loaded into the RibbonTabItem at design time. To integrate custom controls into the RibbonTabItem at runtime, implement the required properties and functions accordingly.
Figure 1: Custom control added to MS RibbonTab
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