Off the top of my head, you might need to do something like this:
Code:
public void mousePressed(MouseEvent e) {
 Object o = e.getSource();
 if(o instanceof Frame)
  System.out.println(((Frame)o).getTitle());
//And I'm also thinking of getParent until you get the class you were looking for; then a test on the title or other parameter would tell you if it was the right object since you'd already have the right class
}