* Returns relative check box.
* @return
*/
public CheckBox getRelativeCheckBox() {
if (this.relativeCheckBox == null) {
relativeCheckBox = new CheckBox();
relativeCheckBox.setText("Relative");
relativeCheckBox.setPreferredSize(new Dimension(100, 30));
relativeCheckBox.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
trajectoryController.notifyRelativeChanged(getRelativeCheckBox().isSelected(), iPosition, jPosition);