Inside the AppBar Control
AppBar is a custom ItemsControl that wraps a Microsoft.Phone.Shell.ApplicationBar. As it is an ItemsControl, it enables you to add buttons and menu items to it, either in code or in XAML, in a manner not unlike the built-in ApplicationBar.
When the AppBar control is first loaded, it sets the host page’s ApplicationBar to its own ApplicationBar field.
The AppBar.Build method is used to populate the ApplicationBar and is called in the following situations:
When its Loaded event is raised
When its collection of buttons or ...
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