These implicit conversion operators can be used to remove the FlyoutItem and Tab objects from the previous example: This is possible because a subclassed Shell object can only ever contain FlyoutItem objects or a TabBar object, which can only ever contain Tab objects, which can only ever contain ShellContent objects. Shell has implicit conversion operators that enable the Shell visual hierarchy to be simplified, without introducing additional views into the visual tree. This is accomplished by using the DataTemplate markup extension to set the ContentTemplate property of each ShellContent object to a ContentPage object. In a Shell application, pages are created on demand in response to navigation. This is because by default, tabs will only be displayed if the flyout item contains more than one tab. In this example, each ShellContent object can only be accessed through flyout items, and not through tabs. The FlyoutItem.Icon property, of type ImageSource, defines the icon of the flyout item: The FlyoutItem.Title property, of type string, defines the title of the flyout item. The following example creates a flyout containing two flyout items: Flyout items appear at the top of the flyout when a flyout header isn't present. Each FlyoutItem object should be a child of the subclassed Shell object. One or more flyout items can be added to the flyout, and each flyout item is represented by a FlyoutItem object. The flyout consists of an optional header, flyout items, optional menu items, and an optional footer: It's accessible through an icon or by swiping from the side of the screen. A flyout is the optional root menu for a Shell application, and is fully customizable. The navigation experience provided by Xamarin.Forms Shell is based on flyouts and tabs.

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