How do I right-align the 'help' menu item in WPF?

Question

I have the following (simplifed) section in my XAML file:

Answer 1

Another possible answer, if you always know how many menu items there will be (and that makes this answer fragile), is to define the Menu.ItemsPanel as a grid, set the Menu to Stretch, set the Grid.ColumnDefinitions appropriately, set the MenuItems to the appropriate Grid.Column, and set the HorizontalAlignment of the last menu item as Right.