Hi tanyeun,

It's difficult to know what's causing the error without seeing a bit more information.

Are you sure you've created graph_pane correctly?

Try putting this near the beginning of your code: 

use Data::Dumper;
$Data::Dumper::Indent = 1;

[download]

and just before the line where the error occurs (Can't call method "gridSize" on an undefined value at tes7 line 23) put this: 

printf "graph_pane => %s\n", Dumper(\$graph_pane);

[download]

Assuming that graph_pane was assigned correctly, it should display the entire underlying data structure.  For example, I get: 

graph_pane => $VAR1 = \bless( {
    'SubWidget' => {
      'scrolled' => bless( {
        '_After_' => {
          'after#3' => bless( [
            ${$VAR1}->{'SubWidget'}->{'scrolled'},
            'after#3',
            'idle',
            'once',
            bless( [
              'Manage',
              ${$VAR1}->{'SubWidget'}->{'scrolled'},
              bless( {
                # 
                # ...Many lines omitted...
                #
  }, 'Tk::Frame' );

[download]

Did you get something like the above, or something completely different?

s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/

In reply to Re^3: Tk: Does the 'grid' geometry manager has a problem with a scrolled parent? by liverpole
in thread Tk: Does the 'grid' geometry manager has a problem with a scrolled parent? by tcarmeli

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