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[LayaAir 2.0]在2.0里如何调用在编辑模式下创建的对话框

如题，在编辑模式下创建了一个Dialog：firstDialog.scene

请问如何在场景中调用它？
firstDialog.scene的内容如下：

{

    "x":0,

    "type":"Dialog",

    "selectedBox":1,

    "selecteID":3,

    "props":{"width":640,"sceneColor":"#000000","height":480},

    "nodeParent":-1,

    "label":"Dialog",

    "isOpen":true,

    "isDirectory":true,

    "isAniNode":true,

    "hasChild":true,

    "compId":1,

    "child":[

        {

            "x":15,

            "type":"Image",

            "props":{"y":0,"x":0,"width":640,"skin":"comp/img_bg.png","sizeGrid":"25,5,5,5","height":480},

            "nodeParent":1,

            "label":"Image",

            "isDirectory":false,

            "isAniNode":true,

            "hasChild":false,

            "compId":3,

            "child":[

                ]

        }],

    "animations":[

        {

            "nodes":[

                ],

            "name":"ani1",

            "id":1,

            "frameRate":24,

            "action":0

        }]

}