title: WPF Ribbon control with custom RibbonMenuItem
body: <p>I'm new to WPF and I'm migrating an application built using Windows Forms to WPF.</p>
  <p>My WPF application contains a Ribbon toolbar (from Microsoft office). I have some <code>RibbonMenuButton</code> and <code>RibbonSplitButton</code> controls on that toolbar.</p>
  <p>My main problem is that when I click on the <code>RibbonMenuButton</code> I want a user control to appear. For example: consider a phone application that contains a Dial button; When the user clicks that button a Popup should appear for the user to select the phone number and if it's an audio or video call.</p>
  <p><a href="https://i.stack.imgur.com/b004k.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/b004k.png" alt="what I would like" /></a></p>
  
  <p>What I'm doing so far was creating a Custom Control that extends RibbonMenuItem but then I have problems with the focus of that popup control: I'm unable to press the Enter to click on the default button.</p>
  <p>Any suggestions?</p>
  <p>Thanks a lot</p>