_setup() {
    if (this.options.enabled === true) {
      // Enable the GUI
      this.guiEnabled = true;

      this._createWrappers();
      if (this.editMode === false) {
        this._createEditButton();
      } else {
        this.showManipulatorToolbar();
      }
    } else {
      this._removeManipulationDOM();

      // disable the gui
      this.guiEnabled = false;
    }
  }
draw or remove the DOM
@private