public final void deactivate() {
preDeactivate();
tgPanel.removeMouseListener(ml);
tgPanel.removeMouseMotionListener(mml);
super.deactivate(); // To activate parentUI from TGUserInterface
}
public final void activate() {
preActivate();
tgPanel.addMouseListener(ml);
tgPanel.addMouseMotionListener(mml);
mouseWasDragged = false;
}