code: function UMLInteractionOperandView() {
          NodeView.apply(this, arguments);
          this.selectable = Core.SK_YES;
          this.movable = Core.MM_NONE;
          this.sizable = Core.SZ_VERT;
          this.parentStyle = true;
          this.minHeight = 15;
          this.height = 30;
  
          /** @member {LabelView} */
          this.guardLabel = new LabelView();
          this.addSubView(this.guardLabel);
      }
docs: UMLInteractionOperandView
  @constructor
  @extends NodeView