Treemap: How to open a search using drilldown when clicked/zoomed on parent rectangle?

I was able to open a search using drilldown when clicked on child rectangle of tree maps as mentioned in official documentation [here][1] http://docs.splunk.com/Documentation/Treemap/1.1.1/TreemapViz/TreeMapComponents But I need to open a search when parent category is Zoomed/Clicked, so far I work when I click am have tried below code but it doesn't pass the token until clicked on children rectangle.

treemaps drilldownsourcetype="syslog"| stats sum(traffic) by category, application0101allmedium$row.category$sourcetype="syslog" category=$category$| top application0barnone

Is it possible to use drilldown when clicked on parent rectangle in treemaps? [1]: http://docs.splunk.com/Documentation/Treemap/1.1.1/TreemapViz/TreeMapComponents