Hope you can help me once more! :)
The problem is that buddypress plugin's widgets are using the same class as regular widgets and I want to change that - I want to style them differently!
I found that the widget code is in the bp-core-widgets.php and I think it gives the class to the widget is this line:
class BP_Core_Whos_Online_Widget extends WP_Widget
(I only think that this is the line - I don't know PHP)
So how to give the widget my own class?