title: How to remove gap between controls in JToolBar?
body: <p>How to remove gap between controls in JToolBar? I want to have no free space between controls in JToolBar.</p>
  
  <p><strong>EDIT:</strong>
  I was wrong. There is no free space. The problem is caused by JButton (situated in JToolBar) with icon only. It has some extra margins around the icon. How to remove them?</p>