title: Slide navigation with user controls in MVVM
body: <p>I'm developping a MVVM application in WPF.
  In my project, I have a main window and many user controls.
  The main window has to be used to host the user controls.
  I would like to set a system which can allow me to navigate between the different users controls with a slide effect.
  The main window doesn't contain no navigation button.
  All the navigations buttons are on the different users controls.
  For example, I have a button (Button A) on the user control A. When I click this button, I would like to switch from user control A to user control B (with a slide effect).
  The user control B has a navigation button too, the button B. When I click the button B, I would like to switch to the user control "X" ("X" is to say that it could be any user control), etc...
  I would like to develop a kind of "navigation service" in which there would be a function like :</p>
  
  <pre><code>NavigationService.SlideTo(new UserControlX(), Directions.LeftToRight);
  </code></pre>
  
  <p>I know it would be difficult but I would like to have some ideas or suggestions in which way I have to work, while keeping the MVVM model.</p>