This can't really be done at a totally generic level as the object is really just the implementation of the given tie interface and doesn't have the tie magic. Probably your best bet is to create a method in the given tie class implementation that recreates the tied variable e.g

{
  package Tie::Hash::Foo;

  use Tie::Hash;

  @ISA = 'Tie::StdHash';

  sub recreate {
     tie my %tmp, __PACKAGE__;
     %tmp = %{$_[0]};
     return \%tmp;
  }
}

use Data::Dumper;

my $obj;
{
  $obj = tie(my %hash, 'Tie::Hash::Foo');
  %hash = qw/foo bar/;
}
my $hash = $obj->recreate;

print "%\$hash is tied\n" if tied(%$hash);
print Dumper($hash);

__output__

%$hash is tied
$VAR1 = {
          'foo' => 'bar'
        };
[download]

That's a rather hackish solution, but it should give you some idea of what to do.
HTH

_________
broquaint