How can I set the ApplicationMenu selected as default? I have this Ribbon:

        <igRibbon:RibbonWindowContentHost>
            <igRibbon:RibbonWindowContentHost.Ribbon>
                <igRibbon:XamRibbon ApplicationMenuMode="Office2010" Theme="Office2010" Name="MyRibbon">
                  ...

and would like that, when the application starts, the ApplicationMenu is selected. I have tried this:

MyRibbon.SelectedTab = MyRibbon.Tabs[0];

but the ApplicationMenu is not part of Tabs[]. Thank you a hint!