Vista - KeyGesture in WPF

Hi,

I have a small test application I am working with to get up to speed on WPF.
One of the things I am trying is working with RoutedCommands. I have the
following snip:

public static RoutedCommand About = new RoutedCommand();

public TestWindow()
{
InitializeComponent();
About.InputGestures.Add(new KeyGesture(Key.F3));
}
OK, the KeyGesture works, but the menu item that is assigned the command
does not DISPLAY "F3" off to the right as I would expect:

<MenuItem Header="About" Command="local:TestWindow.About" />

NOTE: the menu WORKS, pressing F3 WORKS, I just don't see "F3" on the menu
unless I add the InputGestureText property. This seems counter to using
something like:

<MenuItem Header="Cut" Command="ApplicationCommands.Cut" />

which automatically adds "Ctrl-X" for me.

Thoughts?