Raw key events in an rTree

[James Hale]

In a V1 rTree one could assign the focus to the rTree and then respond to arrow keys (on the keyboard) and move around the tree.

V2 of rTree is now a "group"rather than a control and the focus command no longer wants to work, telling me the object is of an invalid type.
I tried focussing on the background field within the rTree group but this didn't work.

Ideas?

James