Passing object to constructor

[Laslo Forro]

Hi there,
I am seeking for the wisdom of yours to help me out with this.
I would like to pass a blessed object to MyApp ( the scenario is as in the
tutorial: http://wxperl.sourceforge.net/tutorial/tutorial3.html ).
In 'main' I try to say
my  $app=myApp->new($obj)

Unfortunately, if I try this:

sub new {
   my ($ref,$obj)=...@_;
my $self=$ref->SUPER::new($obj);
return $self;
}

I receive this error:
sub must be a CODE reference at .../Wx/App.pm line 36.

I would like to use this object from the frame I have created. Eg. I would
like to access the object from an event sub, like
sub OnClick {
      my ($self,$even)=...@_;
      $self->{myObject}->do_this()…
}

(simplified)

How can I pass an object either to the App, or the Frame itself?

Thanx for any hint.