{ "widgettype":"VBox", "options":{ "height":"100%", "width":"100%" }, "subwidgets":[ { "widgettype":"Title3", "options":{ "height":"auto", "text":"This is a tree" } }, { "widgettype":"Filler", "options":{}, "subwidgets":[ { "widgettype":"urlwidget", "options":{ "url":"{{entire_url('tree.ui')}}" } } ] }, { "widgettype":"Text", "options":{ "height":"auto", "text":"This is footer message" } } ] }