title: Strange behaviour with Transitions
body: <p>I set <code>transitions</code> to a Form :</p>
  
  <pre><code>public class Ecran extends Form {
  
      private Transition transIn = CommonTransitions.createSlide(CommonTransitions.SLIDE_VERTICAL, true, 250);
      private Transition transOut = CommonTransitions.createSlide(CommonTransitions.SLIDE_VERTICAL, false, 250);
  
      public Ecran()
      {
          super();
          setTransitionInAnimator(transIn);
          setTransitionOutAnimator(transOut);
      }
  
      public Ecran(String titre)
      {
          super(titre);
          setTransitionInAnimator(transIn);
          setTransitionOutAnimator(transOut);
      }
  }
  
  public class MenuPrincipalForm extends Ecran implements ActionListener, FocusListener, Runnable 
  {
     ...
  }
  </code></pre>
  
  <p>The problem is that in runtime the <code>transition</code> slides <strong>twice</strong> ! So how to make it slide only once ?</p>