get-label in window<%>
Gets a window's label, if any. Control windows generally display their
label in some way. Frames and dialogs display their label as a window
title. Panels do not display their label, but the label can be used
for identification purposes. Messages, buttons, and check boxes can
have bitmap labels (only when they are created with bitmap labels),
but all other windows have string labels. In addition, a message
label can be an icon symbol 'app, 'caution, or
'stop.
The label string may contain ampersands (``&''), which serve as
keyboard navigation annotations for controls under Windows and X. The
ampersands are not part of the displayed label of a control; instead,
ampersands are removed in the displayed label (under all platforms),
and any character preceding an ampersand is underlined (Windows and
X) indicating that the character is a mnemonic for the
control. Double ampersands are converted into a single ampersand
(with no displayed underline). See also
on-traverse-char.
If the window does not have a label, #f is returned.
( -> string (up to 200 characters), send a-window get-label)bitmap% object, 'app, 'caution, 'stop, or #f