synchronising two scroll bars

I have two panes with scroll bars in the vertical and horizontal
directions.  I want to be able to move a scroll bar in one pane and get
the equivalent scroll bar in the other pane to move at the same time and
to the 'same' place.
 
Using a button I can achieve this will the following Perl Tk lines
 
@lcp = $one_pane->yview;
 
$other_pane->yview(moveto => $lcp[0]);
 
How can I get this to be done automatically when I move the scroll bars.
I guess that I need to use a 'bind' whose 'sub' carries out the
equivalent of the two lines.  However I could not see a reference to
this in Chapter 15 of Mastering Perl Tk and other web searches gave me
anything I could use.
 
 
Best regards
 
Henry Merryweather
 
Telephone: +44 (0) 1225 859051
Web: www.merryweathersolutions.co.uk

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