title: Position label within TextButton?
body: <p>I want to use <code>TextButton</code> for my custom made buttons but this requires me to (re)position the <code>text</code> or <code>Label</code> within that <code>TextButton</code>. I have tried some options but i am pretty stuck.</p>
  
  <pre><code>//this seems straightforward but nothing changes.
  final TextButton b = new TextButton("LABEL", skin);
  b.getLabel().setPosition(100, -20);
  
  //Read somewhere about adding new children to buttons but no success either.
  final TextButton b = new TextButton("OLD LABEL", skin);
  b.clearChildren();
  Label l = new Label("NEW LABEL", skin);
  l.setPosition(400, 600);
  b.add(l);
  
  b.layout(); // Does not help either.
  </code></pre>
  
  <p>I am adding the <code>Button</code> straight into the <code>Stage</code> without a table for what it matters. Anyone has some ideas on this?</p>
  
  <p><img src="https://i.stack.imgur.com/9g95D.png" alt="enter image description here"></p>