title: setLocation do not work
body: <p>I have a simple jframe that contains jbutton and jtextfield and jlabe.
  But, when i want to set location to each of them, not move!</p>
  
  <pre><code>public class myFrame extends JFrame{
  
  JButton okButton;
  JPanel mypanel;
  public myFrame(){
  okButton=new JButton("OK");
  mypanel=new JPanel();
  okButton.setLocation(100, 200);
  mypanel.add(okButton);
  this.add(mypanel);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setSize(500, 400);
  setVisible(true);
  
  }
  
  public static void main(String[] args){
  new myFrame();
  }
  }
  </code></pre>