wxperl wxTreeListCtrl::DeleteAllItems usage?

my $simobject_tree = $self->{simobject_tree} = Wx::TreeListCtrl->new( $self, -1, [-1,-1],[500,200]);
...
#later in a "refresh" method that gets called after user actions
my $simobject_tree = $self->{simobject_tree};
$simobject_tree->DeleteAllItems; # segfault!