The SugarCRM Community is now "read-only" to prepare for the SugarClub launch on August 3. Please visit
Announcing SugarClub - Are you in? for more information.
How to add custom buttons next to favorite button for subpanels?
You need to add a field definition into leftColumns at SubpanelListView of such subpanel module (custom/modules/<module_name>/clients/base/views/subpanel-list/subpanel-list.js).
Take a look at recordlist for reference.
Retrieving data ...