installing a new paragraph style .. how to put them at the bottom of the style-bar?

[Giorgio Corani]

I've just installed a new style which allows to manage one column
abstracts in a two-columns papers.
Doing that, I've got available the OneColAbstract paragraph style..
which is now at the top of my style-bar, instead of the "Standard"
entry.
It is quite annoying.
Can i fix that?

thanks, Giorgio