Static text not painted in dialog

[Foo JH]

Hi all,

I'm wondering why my Wx::StaticText is not painted in my test dialog. 
The following is the code I used:

   my $dlg = Wx::Dialog->new(
       $this,
       -1,
       'SMARTSync Dialog',
       wxDefaultPosition,
       [200,70],
       );
   my $MainSizer = Wx::BoxSizer->new(wxVERTICAL);
   $dlg->SetSizer($MainSizer);

   my $label = Wx::StaticText->new($dlg,-1,
       "Can you read me?");
   $MainSizer->Add($label,0,wxALL|wxGROW,5);
   $dlg->Show(1);


The dialog window shows, but the part where the text should be painted 
is transparent.

Any help is appreciated. Thanks.