@Override
					public void keyReleased(KeyEvent e) {
						switch(e.keyCode){
						case SWT.ARROW_UP:
							userCommand = 1;
							setChanged();
							notifyObservers();
							break;
						case SWT.ARROW_DOWN:
							userCommand = 2;
							setChanged();
							notifyObservers();
							break;
						case SWT.ARROW_RIGHT:
							userCommand = 3;
							setChanged();
							notifyObservers();
							break;
						case SWT.ARROW_LEFT:
							userCommand = 4;
							setChanged();
							notifyObservers();
							break;
							}
					}