title: WPF Fluent Ribbon KeyTip shortcuts not firing commands
body: <p>I'm using the Fluent <code>Ribbon</code>. I'm trying to get the <code>KeyTip</code>s working. It works fine for navigation, as I can navigate about between tabs and everything displays correctly. My problem is nothing happens when i finally try to run a command. Take the button below. I can navigate to it by pressing <kbd>ALT -> F</kbd>, when I then press <kbd>C</kbd> nothing happens except it removes the <code>KeyTip tooltip</code>. It do not run the actual command. It works fine if I simply click the button. XAML example below of how I bind my command.</p>
  
  <pre><code>&lt;Fluent:Button Command="{Binding ExitCommand}"
                 Fluent:KeyTip.Keys="C"
                 Header="Close" /&gt;
  </code></pre>
  
  <p>Is there some special way i need to setup the commands when using KeyTip's?</p>
  
  <p>I've tried the sample that comes with the Fluent library but they don't actualy implement any commands. But if i implement a simple command in it it do not work there either.</p>
  
  <p>So is KeyTip's purely graphical navigation of the Ribbon and do i need to implement my own hotkey listeners using Gestures and other stuff available in WPF to fire the commands?</p>