Remove spaces in dialog window

our @ISA = qw(Gtk2::Dialog);

sub new
   my ($class, $parent, $title)  = @_;
   my $self = {};
   bless($self, $class);

   $self->{win} = $class->SUPER::new($title, $parent, "modal");

In the bottom of dialog box/window, it has spaces (arround 5px) between the last widget and the window border. However, it's not happen with in the top, which no space between border and first widget.
How do I remove the additional spaces?

| [widget A]
| [widget B]
|               <---- there is additional spaces here...



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