}
public void actionPerformed(final ActionEvent e) {
final ModeController modeController = Controller.getCurrentModeController();
final NodeModel selectedNode = modeController.getMapController().getSelectedNode();
final IMapViewManager mapViewManager = Controller.getCurrentController().getMapViewManager();
final Component mapViewComponent = mapViewManager.getMapViewComponent();
if (mapViewManager.isLeftTreeSupported(mapViewComponent) && selectedNode.isLeft()) {
moveDownwards(selectedNode);
}
else {
moveUpwards(selectedNode);
}