Amiga Keyboard Shortcut Theory

   You can specify keyboard shortcuts for each item, if you want.  You
   are not allowed to use the same key for more than one item (ButtonMenu
   will tell you if you do).  Pressing any of the keys a..z in your
   generated menu will have exactly the same effect as keys A..Z, thus
   case is not important (unless you have the doc function enabled!)

   There are a few ways of denoting the keyboard shortcut in the item
   text.  For example, with shortcut `B' you could have:

     [B]uttonMenu    or    (B)uttonMenu    or    {B}uttonMenu    etc...

   But the preferred way is to use an underscore character underneath
   the letter to be emphasized - like most new Amiga applications.  You
   do this in ButtonMenu by putting an `_' character directly before the
   character to be underscored.  For example:

                 "_ButtonMenu"   produces     ButtonMenu
                                              -

   Therefore, only use the underscore character for this purpose - using
   more than one won't make any difference as the leftmost ones will be
   ignored and not displayed.