Override this method to initialize a PageFunction(Of T) when it is navigated to for the first time.
Assembly: PresentationFramework (in PresentationFramework.dll)
This method is only called on the initial navigation. It is not called if a PageFunction(Of T) is later reactivated.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)