final Button getNodeAtButton = new Button(optionGroup, SWT.TOGGLE);
getNodeAtButton.setText("Push and click on tree");
final IMouseListener listener = new IMouseListener() {
@Override
public void mouseChanged(CometeMouseEvent event) {
MouseReason reason = event.getReason();
if (reason == MouseReason.PRESSED) {
int x = event.getX();
int y = event.getY();
ITreeNode nodeAt = theComponent.getNodeAt(x, y);