NAME
App::Chart::Glib::Ex::TieWeakNotify -- notify signal from weakened property setting
SYNOPSIS
use App::Chart::Glib::Ex::TieWeakNotify;
sub SET_PROPERTY {
  my ($self, $pspec, $newval) = @_;
  my $pname = $pspec->get_name;
  if ($pname eq 'model') {
    App::Chart::Glib::Ex::TieWeakNotify->set ($obj, $pname, $newval);
  }
  # ...
}