use strict;
use warnings;
use Tk;
my $mw = MainWindow->new;

my %next_color=(red=>'yellow',yellow=>'red');

my $lb = $mw->Scrolled(
    "Listbox",
    -bg        => 'yellow',
    -fg        => 'red',
     -scrollbars    => 'e',    
)->pack;
$lb->insert('end', "Item1", "Item2", "Item3");

$lb->bind(    '<Double-1>',
    sub{
		my $sel =  $lb->curselection()->[0];
		print "pressed $sel\n";
		my $current_color_bg = $lb->itemcget($sel, '-background') || 'yellow';
		my $current_color_fg = $lb->itemcget($sel, '-foreground') || 'red';
		print "current color of the element $sel is $current_color_bg on $current_color_fg\n";
		$lb->itemconfigure( $sel, 
							-background=> $next_color{$current_color_bg},
							-fg=>$next_color{$current_color_fg}
		);	
	}
 );
MainLoop;