<P>Defines the options of a mega widget and what actions
are triggered by configure/cget of an option
(see <A HREF="../../../Tk/ConfigSpecs.html">the Tk::ConfigSpecs manpage</A> and <A HREF="../../../site/lib/Tk/Derived.html">the Tk::Derived manpage</A> for details).</P>
<P>
<H2><A NAME="construct">Construct</A></H2>
<P>Make the new mega widget known to <STRONG>Tk</STRONG>.</P>