Out of curiosity, how would we  "provide your own HIView subclass" , as 
suggested below, in FB?

On Apr 28, 2005, at 1:03 AM, Robert Purves wrote:

>  *  kEventClassWindow / kEventWindowClickContentRgn
> <snip>
>  *    Note that this event is not sent for composited windows; all
>  *    mouse-downs in a composited window are handled by a view, and
>  *    there is no ”content region” in a composited window. To intercept
>  *    a content region click in a composited window, install a
>  *    kEventControlClick handler on the window’s content view, or
>  *    provide your own HIView subclass.
>
> Robert P.
>
----
Scott Spencer
sj3@...