get <code>megaspinbox</code>, use this lines:</p>
  
    <pre>
(start-tk)
(eval-wish "source {megaspinbox.tcl}")
(define mbox (tk 'create-widget 'megaspinbox))
</pre>
  
    <p>Because it is frequently used, the megawidget <code>scrolledtext</code> is hard-wired in chicken/Tk so that you don't need to source it yourself.</p>
  

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