code: public static void show(boolean manage, String deflt, IEventListener closeListener) {
          Map<String, Object> args = new HashMap<>();
          args.put("manage", manage);
          args.put("deflt", deflt);
          PopupDialog.show(RESOURCE_PREFIX + "layoutManager.fsp", args, true, true, true, closeListener);
      }
docs: Invokes the layout manager dialog.
  
  @param manage If true, open in management mode; otherwise, in selection mode.
  @param deflt Default layout name.
  @param closeListener Close event listener.