ectiveUiConfig = {
        type: Dynamsoft.DDV.Elements.Layout,
        flexDirection: "column",
        children: [
            {
                type: Dynamsoft.DDV.Elements.Layout,
                className: "ddv-perspective-viewer-header-mobile",
                children: [
                    {
                        // Bind event for "PerspectiveAll" button
                        // The event will be registered later.
                        type: Dynamsoft.DDV.Elements.PerspectiveAll,
             