{"menu": {
    "header": "Viewer",
    "items": [
              {"id": "Open"},
              {"id": "OpenNew", "label": "Open New"},
              null,
              {"id": "ZoomIn", "label": "Zoom In"},
              {"id": "ZoomOut", "label": "Zoom Out"},
              null,
              {"id": "Help"},
              {"id": "About", "label": "About Viewer..."}
             ]
}
}