{ "widgettype":"VBox", "options":{ "width":"100%", "height":"100%" }, "subwidgets":[ { "widgettype":"urlwidget", "options":{ "url":"{{entire_url('top.ui')}}" } }, { "widgettype":"urlwidget", "options":{ "url":"{{entire_url('center.ui')}}" } }, { "widgettype":"urlwidget", "options":{ "url":"{{entire_url('bottom.ui')}}" } } ] }