title: Dialog's object position Libgdx
body: <p>I have a Dialog :</p>
  
  <pre><code>Dialog dialog=new Dialog("",style);
  dialog.setSize(400, 500);
  dialog.setPosition(Gdx.graphics.getWidth()/2-200, Gdx.graphics.getHeight()/2-300);
  </code></pre>
  
  <p>I added a two button in it:</p>
  
  <pre><code> dialog.button(stopButton);
   dialog.button(goButton);
  </code></pre>
  
  <p>My problem is that I  can not change the position of buttons, not even if the imposed manually the buttons remain in the same position.</p>
  
  <p>how could I do to solve the problem?</p>
  
  <p>Thank you</p>