Bug in TreeGrid with frozen column and arrowKeyAction: "focus"

There is a bug in TreeGrid with frozen column when I set arrowKeyAction: "focus" where the locked column is not being selected during keyboard arrow navigation.

You can replicate on your demo here
http://www-demos.smartclient.com/iso...ise#freezeTree

just add arrowKeyAction: "focus" and try navigating records with arrows

The locked column is not being selected.

Also when arrowKeyAction: "select" - navigating with arrows does not apply "Over" class to the locked column