Dear Monks, I have a perl/tk application that uses graphviz to plot a graph. 
my $gv = $root->Scrolled('GraphViz', 
                             -background => '#B0C0FF', 
                             -scrollbars=>'se',
                             ) ->pack (-side=>'top',-expand 
                                        =>1, -fill=>'both');

[download]
All is well except that what I'd like is that when a user resizes the window, the graph displayed should be "layedout" again so that it adjusts to the size of the window. I first tried to bind the '<Configure>' event to the canvas this way: 
my $canvas = $gv->Subwidget("canvas');
$canvas->bind('<Configure>', sub {
                                  my $w = shift;
                                  print $w->Width . " and " . $w->Heig
+ht . "\n";
                                  &redo_layout();
                                 };

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But nothing happens! I the binding is not used and the Subwidget returns an undefined "$canvas". So I modified the above code to bind the root window with Configure as in: 
$root->bind('<Configure>', sub {
                                  my $w = shift;
                                  print $w->Width . " and " . $w->Heig
+ht . "\n";
                                  &redo_layout();
                                 };

[download]
This works! But the behavior is not great. The graph layout does adjust but is a very "flickery" way. And strangely, window resize prints a lot of values for width and height when the bound subroutine is called. What can I do to make this a nice user experience? Why can't I bind '<Configure>' to the subwidget "canvas'? Thank you in advance.

In reply to perl tk graphviz by dlal66

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