NavigationService.FragmentNavigation Event
Occurs when navigation to a content fragment begins.
Namespace: System.Windows.Navigation
Assembly: System.Windows.Controls.Navigation (in System.Windows.Controls.Navigation.dll)
Typically, you use the OnFragmentNavigation method instead of creating an event handler for the FragmentNavigation event. Using the OnFragmentNavigation method is preferable because you do not have to remove the event handler from the NavigationService object to avoid object lifetime issues.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.