keystroke to go to bottom or top of register

[bugreport19621012 at fastmail.fm]

When I scroll back and forth in the Basic Ledger view of some account, going to the top (earliest transaction) and then to the bottom (where I am able to enter a new transaction), is there some keystroke that will take me immediately to the top or the bottom?

I am running GnuCash 2.3.17 build svn r19852M dated 2010-11-21 on a MacBook Pro.

Currently the only keystroke I know is to hit "page up" repeatedly or "page down" until I finally get where I want to be. If one has several years' transactions this would take forever.

Alternatively one has to use the mouse, which also takes a lot of time.

A single keystroke combination to go to "top" or "bottom": is there such a thing?

Thanks

Jake