Try separating instantiation from initialization:

package foo;
use strict;

sub new
{
    print "foo::new\n";
    my $self = bless( {}, shift );
    $self->init(@_);
    return $self;
}

sub init
{
    print "foo::init\n";
    my $self = shift;
    my %args = ( foo=>undef, @_ );
    $args{foo} = "foo" if ! defined $args{foo};
    $self->foo($args{foo});
}

sub foo
{
    my $self = shift;
    $self->{_foo} = shift if @_;
    return $self->{_foo};
}
1;
[download]

---

package bar;
use strict;

sub new
{
    print "bar::new\n";
    my $self = bless( {}, shift );
    $self->init(@_);
    return $self;
}

sub init
{
    print "bar::init\n";
    my $self = shift;
    my %args = ( bar=>undef, @_ );
    $args{bar} = "bar" if ! defined $args{bar};
    $self->bar($args{bar});
}

sub bar
{
    my $self = shift;
    $self->{_bar} = shift if @_;
    return $self->{_bar};
}
1;
[download]

---

package foobar;
use strict;
use foo;
use bar;
use vars(qw(@ISA));
@ISA=qw(foo bar);

sub new
{
    print "foobar::new\n";
    my $self = bless( {}, shift );
    $self->init(@_);
    return $self;
}

sub init
{
    print "foobar::init\n";
    my $self = shift;
    my %args = ( @_ );
    $self->foo::init(%args);
    $self->bar::init(%args);
}

sub getFooBar
{
    my $self = shift;
    return $self->foo() . $self->bar();
}
1;
[download]

---

use strict;
use foobar;

main();

sub main()
{
    my $fb = new foobar( foo=>'Lance', bar=>'Deeply' );
    print $fb->getFooBar() ."\n";
}
[download]

---

---

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