Here's an example. This shows me the current space weather as tray icon. Right click displays details (as menu entries), clicking on any of those reloads the data.

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

use strict;
use warnings;

use PerlTray;
use Ham::Reference::Solar;

my $solarstate;
my $errorstate;
my $lastkindex = -1;

SetIcon("nostate");
my %icons = (
    -2  => "errorstate",
    -1  => "nostate",
    0   => 'k0',
    1   => 'k0',
    2   => 'k0',
    3   => 'k0',
    4   => 'k0',
    5   => 'k1',
    6   => 'k2',
    7   => 'k3',
    8   => 'k4',
    9   => 'k5',
);

sub internalUpdate {
    undef $solarstate;
    
    my $solar = new Ham::Reference::Solar;
    if($solar->is_error) {
        undef $solarstate;
        $errorstate = $solar->error_message;
        SetIcon("errorstate");
        Balloon("Failed to update solar weather status", "Solar Weathe
+r", "error");
        $lastkindex = -2;
    } else {
        $solarstate = $solar->get_hashref;
        my $newk = $solarstate->{'k-index'};
        if($newk != $lastkindex) {
            if($lastkindex >= 0 && $newk > $lastkindex) {
                Balloon("Geomagnetic activity has risen!", "Solar Weat
+her", "warning");
            }
            my $oldicon = $icons{$lastkindex};
            my $newicon = $icons{$newk};
            SetIcon($newicon);
            SetAnimation("0:05", 200, ($oldicon, $newicon));
            $lastkindex = $newk;
        }
    }
    
    SetTimer("10:00");
}

sub PopupMenu {
    my($default,@menu) = "*";

    if(defined($solarstate)) {    
        foreach my $key (sort keys %$solarstate) {
            push @menu, ["$key: " . $solarstate->{$key}, \&Timer];
        }
    } else {
        push @menu, ["ERROR: $errorstate", \&Timer];
    }

    return [ @menu,
         ["-------"],
         ["Refresh",            \&Timer],
         ["Exit",               "exit"]
       ];
}

sub Timer { internalUpdate() }

sub ToolTip {"Solar Weather Tray"}

Timer();
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