Assembly: System.Windows.Controls.Navigation (in System.Windows.Controls.Navigation.dll)
The default implementation potentially uses the FrameworkElement.Name of the owner Frame. Note that this Name is not typically the primary string for UI Automation naming purposes, because it is often not intended to be human readable, and may even be generated by a designer. If generated by the designer, the name may be something like "Frame1" and thus duplicate the information of the localized control type name.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.