constructor
[labellabel][parentparent][callbackcallback][ [shortcutshortcut][help-stringhelp-string][demand-callbackdemand-callback][shortcut-prefixshortcut-prefix]])label:label-string?shortcut-prefix :'shift'option))
See set-label for information about mnemonic &s in label.
If shortcut is not #f, the item has a shortcut. See get-shortcut for more information. The shortcut-prefix argument determines the set of modifier keys for the shortcut; see get-shortcut-prefix .
If help is not #f, the item has a help string. See get-help-string for more information.