Finding the documentation is a bit tricky. You need to read the following paragraph in Tk::Tree:
The Tree class is derived from the HList class and inherits all the methods, options and subwidgets of its super-class.

And Tk::HList shows what we need to do:

Each list entry in an HList widget is associated with a display item. The display item determines what visual information should be displayed for this list entry. Please see Tk::DItem for a list of all display items.

Having read Tk::DItem, we can now solve the problem:

#! /usr/bin/perl
use warnings;
use strict;

use Tk qw{ MainLoop };
use Tk::Tree;
use Tk::ItemStyle;

my $mw   = 'MainWindow'->new(-title => 'Tree');
my $tree = $mw->Tree->pack(-fill => 'both', -expand => 1);

$tree->add($_, -text => $_) for qw( orange orange.red orange.yellow );

my $blue = $tree->ItemStyle('imagetext', -foreground => 'blue');
$tree->itemConfigure('orange.red', 0, -style => $blue);
MainLoop();

[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Tk::Tree how to set color of entry after tree creation by choroba
in thread Tk::Tree how to set color of entry after tree creation by EnzoXenon

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.