[Catalyst] action whose name started with underscore

[Hu Hailin]

Hello,

I defined some actions in controller for inner forwarding purpose.
To make the purpose clearly, I named them starting an underscore.

----------
package MyApp::Controller::Root;

sub foo : Local {
  # blahblahblah
  $c->forward('_bar');
}

sub _bar : Private { #blahblahblah }
----------

in this way, I can't trace the forwarding in debug mode witch supposed
to be something like

----------
| /foo
|  -> /_bar   <- this line doesn't exists
----------

Actually, the forwarding works as expected inside.
Is it a implicit rule, or does an action starting with underscore mean
something special?

Thanks.
-- 
islue