code: private void showContextMenu(ContextMenuEvent e) {
          ContextMenu menu = view.getContextMenu();
          double xOffset = view.getContextMenuXOffset();
          double yOffset = view.getContextMenuYOffset();
  
          menu.show(view, e.getScreenX() + xOffset, e.getScreenY() + yOffset);
      }
docs: /* ********************************************************************** *
  Mouse handling implementation                                          *
  **********************************************************************