Is it possible to control a scrollable jquery ui dialog using keys (PgUp, PgDn, … spacebar?…)

Is it possible to control a scrollable jquery ui dialog using keys (PgUp, PgDn, … spacebar?…)

I have a jQuery UI dialog that has enough content to trigger the appearance of vertical scroll bars. I found that the only way to make it scroll was to either click-and-drag the scrollbar, or click in the scrollbar area - i.e. it was not possible to make it scroll using the PgUp or PgDn keys, nor the arrow keys or spacebar, etc. What would be the best way to enable keyboard activated scrolling?

[Note: I'm actually using an enhanced version of the jQuery UI dialog (http://www.fieryprophet.com/demo/jqui-dialog-minmax/) but have found the same issue with the normal one.]