BuddyPress front-end Admin Bar

Hello hello,

I try to hide the BuddyPress front-end bar when a visitor go to a blog of my network.

I found a lot of plugins who can do this for WP but nothing for the BuddyPress bar.

I just found this code for wpconfig : define( 'BP_DISABLE_ADMIN_BAR', true );

But i don't want to completely disable the front-end admin bar, just hide this bar by a blog admin of the network. (blog by blog)

That's mean an user of a blog on my network (admin of his own blog) can choose to hide or show the BuddyPress font-end admin bar.

Someone know a hack or a plugin to do that ?

Thank you.