Unable to drilldown within a dashboard in splunk 6.6.4

[splunkitsipoc]

Hi , I have a dashboard in splunk 6.6.4 which was migrated from 6.0.1 . The dashboard calls internally css and script files which have the drilldown logic. The dashboard works fine in 6.0.1 but in 6.6.4 , the onclick event is not working and even the image css is not rendered in ui.

Please let me know if anyone has any idea

[amitm05]

Can you mention how you are defining your drill downs ?
Have a look here -
https://docs.splunk.com/Documentation/Splunk/6.6.4/Viz/DrilldownIntro
http://dev.splunk.com/view/webframework-developapps/SP-CAAAESJ