public static Point getCenterOf(final Component aContainer, final JComponent content) { final JComponent component = getTargetComponent(aContainer); Point containerScreenPoint = component.getVisibleRect().getLocation(); SwingUtilities.convertPointToScreen(containerScreenPoint, aContainer); return UIUtil.getCenterPoint( new Rectangle(containerScreenPoint, component.getVisibleRect().getSize()), content.getPreferredSize()); }