Use drilldown token in URL

[coreyCLI]

I have a simple dashboard with a few single value visualizations.  Clicking on then will open a panel below to reveal a table related to that single value using depends=$token$.  These single value metrics are also tied to scheduled searches that send out email alerts when issues arise.  What I need to figure out is how to format the "link" in the email that will open this dashboard (this part is easy), but will ALSO open the table below the single value metrics.  

Here is the current drilldown for a single value.

<drilldown>
   <set token="idx"></set>
</drilldown>

Here is how I am using it in the panel to be opened.

<row id="panel4" depends="$idx$">

I have tried changing the drilldown to this.

<drilldown>
   <set token="idx">open</set>
</drilldown>

and tried using this URL to link to the dashboard and ALSO open the panel below.  But it does not work.

https://fqdn/en-US/app/appname/dashboardname?idx=open

[ITWhisperer]

What you appear to be doing should work, is it possible that the dashboard is unsetting the token?

[coreyCLI]

I have no "unset" configured for that token so I don't believe so.