How to Set Scroller to Bottom, after Sending Messages

Hello,

Every time a message is sent using BP Better Messages, the scroll bar automatically goes to the top (where the oldest messages are). Ideally, I want the scroll bar to always go to the most recent message, every time a message is submitted. I am assuming this cannot be done using CSS. I believe is requires a php code in bp-custom.php, but I am not sure what kind of code I need.

Any help is much appreciated.

Kind regards,

Jamie