Activating tab

YuLo <[email protected]> Tue, 10 Dec 2013 12:33:18 -0800 (PST)

Newsgroups	gmane.comp.mozilla.devel.xpfe
Message-ID	<[email protected]>

I wondering how can I activate tab in c++ XPCOM of my xulrunner application.
I can add tab using DOM interface.
As far as I see DOM interface have no means to activate tab.
Is there any other way?