code: function() {
        _.each(cdb.core.View.views, function(view) {
          _.each(view, function(prop, k) {
            if( k !== '_parent' &&
                view.hasOwnProperty(k) &&
                prop instanceof cdb.core.View &&
                view._subviews[prop.cid] === undefined) {
              console.log("=========");
              console.log("untracked view: ");
              console.log(prop.el);
              console.log('parent');
              console.log(view.el);
              console.log(" ");
            }
          });
        });
      }
docs: search for views in a view and check if they are added as subviews