ton unposts without invoking
any menu entry.
<P><LI value="6">
When a menubutton is posted, its associated menu claims the input
focus to allow keyboard traversal of the menu and its submenus.
See the <B><A HREF="menu.html">menu</A></B> manual entry for details on these bindings.
<P><LI value="7">
If the <B>-underline</B> option has been specified for a menubutton
then keyboard traversal may be used to post the menubutton:
Alt+<I>x</I>, where <I>x</I> is the underlined character (or its
lower-case or upper-