side effect of ->new()->SetValue()

[herbert breunung]

hello pros,

i have here an minimal sample where i cant replace

my $c = Wx::Choice->new($poben,-1,[-1,-1],[-1,-1],[qw(Kreuz penta hex)],1);
$c->SetSelection(1);
$rechtersizer->Add( $c, 0, wxALL, 5);

with

$rechtersizer->Add( Wx::Choice->new($poben,-1,[-1,-1],[-1,-1],[qw(Kreuz penta
hex)],1)->SetSelection(1), 0, wxALL, 5);

without the side effect that the widget is not on its expected place but
hanging in left upper corner. additional layout and bunch other tricks didnt 
help.

so is this a bug?

thanks for answers