When the action creates a popup menu, I think we want to bind it to
the mouse-down event. I seem to situations where the menu would
disappear as soon as you released the mouse. If you released the
mouse on a menu item, that menu item has been "chosen" by the user.
I do not agree on this. The reason we do not agree is perhaps that I am
using MS Windows and you are not (I do not know what you are using)?
On MS
Windows I believe it is standard that CLICKING mouse 2 brings up a
popup
menu (if there is any). You can then use the keyboard or the mouse to
choose
from this menu.
My impression of this "standard" is that it is good because you do not
have
to use the mouse very much, which can be difficult for some people and
for
some other is an unnecessary burden and a hazard. I believe that this
could
be a reason for the choice MS has made here.