Backstage Close Button not showing

Hi,

we are trying to build an application looking similar to Office 2013. We need a small help icon in the title bar and an application menu (backstage).

In one of your samples (ThemeSamples: MetroStyleWindow) we found a way to insert a button into the title bar. This works great. But if you click on the "File"-Tab to show the application menu, the menu is shown without a close button (circle with arrow) above.

Is there a better way to get the help button or a solution without the backstage close button diappearing?

Thanks in advance

Marc