// menuMaker = voidfunc(JPopupMenu)
// return true if menu could be added
sbool titlePopupMenu(final Component c, fO menuMaker) {
  JComponent titleBar = getTitlePaneComponent(getPossiblyInternalFrame(c));
  if (titleBar == null)
    ret false with print("Can't add title right click!");
  else
    ret true with componentPopupMenu(titleBar, menuMaker);
}