How to edit a custom stream item?

Hello,

I have created an app which allows to populate, store and display custom fields in a stream item. How can I add a custom edit form which will be displayed when a user selects "Edit this item" command?

I've checked the code and found that the response to that command is hard-coded in "{editStream} click" event handler in media/com_easysocial/scripts/site/stream/item.js. Is it possible to override that handler for my stream item type without changing ES code?

Regards,
Vladimir