HI Nivedita,
I was working on the similar thing and was facing the same problem, I found out an alternative solution for it and it solved my purpose (might be of use for you as well).
So here it goes:
In my case I had few browser and then I had to create a drill down so that when I click on browser I get into the dashboard that shows the stats for its version, so every bar in the dashboard was suppose to link to the other dashboard containing version specific to the browser. Just like this:
https://www.dropbox.com/s/e7cfanss17l77pv/MainDashboard.PNG?dl=0
Here is the thing that I did:
I created a dashboard (I will call it as main dashboard) that showed me all the browser info one that is in the attached link (like IE, Chrome etc), then I created another dashboard with the name starting with Browser name that was in the main dashboard (for eg. IE_versions, that contains all the version stats for the IE, So when I click on IE bar in main dashboard it should come here).
Point to note here is that when you create the dashboard in the Dashboard ID please start the id name with same letters as bar value and in same case (like in my case I set the Id to be IE_version_count).
Here is what the version dashboard looks like:
https://www.dropbox.com/s/an93dbl9oykxt17/IE_version_count.PNG?dl=0
Here is the main part:
In the XML add the following line:
<drilldown>
<link><![CDATA[/app/search/**$click.value$**_version_count?earliest=0&latest=]]></link>
</drilldown>
The click.value will take the value of the bar and place in the URL which takes it to the desired dashboard (like for chrome it will take me to Chrome_version_count and so on)
The disadvantage is that you have to follow the name every time you create a new dashboard (but I guess that is not that a big problem).
(I have tried my best to explain but if there is anything unclear please ask in the comments and I will try my best to solve it)
Vinod.
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