my $label_formatting = $button->child->font_style;

##</code><code>##

$window->title('foo')->border(20);

##</code><code>##

eval {$window->title('foo')->border(20)};
if ($@) {...do something...}

##</code><code>##

eval {$window->title('foo')};
if ($@) {....}
else {eval {$window->border(20)}
      if ($@) {....}}

##</code><code>##

$obj->foo($obj->bar($baz))