Keys Do Not Emit Key Press Event for Treeview Widget

[Rob Thornton <rthornton128 gmail com>]

My application contains a treeview widget. The delete and insert keys
insert and delete rows as expected but I need to trap their events so I can
modify their behaviour. I also need to modify the Escape key. I tried
connecting to "key-press-event" but does not seem to work nor via the
generic "event" signal and testing for a GDK_KEY_PRESS event type. What
signal is emitted when they are pressed? How do I respond to these key
presses?