gtk2-perl-xs viewport with null adjustments?

[Steven Usdansky <usdanskys rocketmail com>]

Is there a Gtk2::Perl equivalent of the C-statement     
     my_viewport = gtk_viewport_new (NULL, NULL); 
The old Gtk-Perl tutorial is a bit light on the subject of viewports, the
perl-gtk-ref.pdf says that the parameters may be undef, but I can't for the
life of me figure out what to put in the parentheses, and    
     my $my_viewport =Gtk2::Viewport();  
aborts with the message      
     variable is not of type Gtk2::Adjustment at ./ip_viewer.pl line 35

-- 
Traveling Geologist