You could try using FlyoutPage and make it the root page of your app, and then add TabbedPage as the detail page, then the flyout and tab will display in the same screen, but they cannot be in a same shell.
<FlyoutPage ... > <FlyoutPage.Detail> <NavigationPage> <x:Arguments> <local:MyTabbedPage></local:MyTabbedPage> </x:Arguments> </NavigationPage> </FlyoutPage.Detail> <FlyoutPage.Flyout> <local:NewPage></local:NewPage> </FlyoutPage.Flyout> </FlyoutPage>
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