rich-text-pane vs. ESC

Under LWW (at least), if one does:

(capi:contain (make-instance 'capi:rich-text-pane))

then types a few characters, then hits the Escape key (ESC), the rich-text-pane disappears, but the container does not.

Does anyone know what is going on? In my app, I see something similar - I have a rich-text-pane on a pinboard whose input model intends to capture ESC's, but, when ESC is hit, the whole pinboard vanishes from sight.

thanx