/// <summary>
/// Adds a go back handler at the end of the handler queue.
/// For example called when back key has been pressed on Windows Phone or backspace key or alt-left has been pressed Windows.
/// </summary>
/// <param name="handler">The handler. </param>
/// <returns>Returns the created async go back handler which is used for deregistration (RemoveGoBackAsyncHandler). </returns>
public Func <CancelEventArgs, Task> AddGoBackHandler(Action <CancelEventArgs> handler)
{
return(NavigationKeyHandler.AddGoBackHandler(handler));
}
/// <summary>
/// Removes an async go back handler.
/// </summary>
/// <param name="handler">The handler. </param>
public void RemoveGoBackAsyncHandler(Func <CancelEventArgs, Task> handler)
{
NavigationKeyHandler.RemoveGoBackAsyncHandler(handler);
}
