How can I draw colorful characters on Gtk2::Button?

[xu zhou <redicaps gmail com>]

Hi all, I am quite a new for Perl-Gtk2. I am tring to put some
colorful numbers on the button widget.
$button->set_label($style) dose not seem to work this way, it only
receive a string as the parameter, not a Gtk2::Lable.
Thx