Node.active = false 为什么浏览器报错

Creator 2.x
#1

代码：
properties: {

    bg_1:cc.Node,

    bg_2:cc.Node,

    titleBox:cc.Node,

},

//
this.titleBox.active = true;

浏览器报错：Uncaught TypeError: Cannot set property ‘active’ of undefined

#2

编辑器没拖进去

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