(let ((hstring (toolbar-button-help-string button)))
(setq last-help-echo-object help)
(or (stringp hstring)
(setq hstring (funcall hstring help)))
(let ((hstring (toolbar-button-help-string button)))
(setq last-help-echo-object help)
(or (stringp hstring)
(setq hstring (funcall hstring help)))