        children: [
                    {   
                        // Bind event for "PerspectiveAll" button
                        // The event will be registered later.
                        type: Dynamsoft.DDV.Elements.PerspectiveAll,
                        className: "ddv-perspective-viewer-perspective-desktop",
                        events:{
                            click: "done"
                        }
                    },
                ],
            },
            Dynamsoft.DDV.Elem