Ungroup fixed still not finished ^^''

src/ui/view/UpperNodeCanvas.java

@@ -144,7 +144,7 @@ public class UpperNodeCanvas extends JPanel implements MouseListener, MouseMotio
 			}
 		});
 		
-		itemGroup.addActionListener(new ActionListener() {
+		itemUngroup.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
 				controller.delUpperNode((CpsUpperNode) tempCps, UpperNode);