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[LayaAirIDE 2.0]2.0按钮添加事件报错 cannot read property 'on' fof undefined

class GameLogin extends ui.login.login_bgUI {
constructor() {
super();
this.btn_register.on("click", this, this.ToRegisterPage);
}
ToRegisterPage() : void {
this.loadScene("login/register_page");
}
}

//调用on的时候直接会报Cannot read property 'on' of undefined

我再把生成的ui代码贴出来
export class login_bgUI extends View {
        public btn_close:Laya.Button;
        public lab_account:Laya.TextInput;
        public btn_login:Laya.Button;
        public lab_password:Laya.TextInput;
        public btn_register:Laya.Button;
        public chkbox_account_rem:Laya.CheckBox;
constructor(){ super()}
createChildren():void {
super.createChildren();
this.loadScene("login/login_bg");
}
}