Thanks for the feedback, unfortunately fixing the extended class name does not solve the problem :(

Well, not surprising, fixing thinkos rarely fixes "bugs" :)

Well, it might be considered a bug that Moo isn't as helpful as Moose, Moose actually checks the class is blessed into the right, Moo doesn't

Quick workaround is

sub MenuBar::Item::BUILD {
    my $self = shift;
    bless $self, __PACKAGE__ ;
    $self->Append( $self->item_quit );
    return $self;
}
[download]

Now why doesn't Wx::Menu obey the common rules of subclassing/inheritance, well not all things in wxPerl are mean to be subclasses, and indeed menu/menubar are indeed odd candidates for that ... some of this is explained in Re: wxperl-users scalar reference objects?

As you can see a Wx::Menu isn't a hashref, its a scalar ref

FWIW, not everything needs to be subclasses, ex wxperl_usage

Thank you, for the explanations. I'm following the "not everything needs to be subclasses" path.

P.S.: I didn't really think that changing 'Wx::Menu' to 'Wx::MenuItem' will fix the problem :)