Here's a simple program demonstrating the problem:

#!/usr/bin/perl

use Wx;
use warnings;

package MyApp;

use strict;
use vars qw( @ISA );

@ISA = qw( Wx::App );


sub OnInit {
  my $self = shift;
  my $frame = MyFrame->new("Dungeon Construction Kit", [50,50], [450,3
+50]);

  $self->SetTopWindow($frame);
  $frame->Show( 1 );

  1;
}


package MyFrame;

use strict;
use vars qw( @ISA );

@ISA = qw( Wx::Frame );


sub new {
  my $class = shift;
  my ($title, $pts, $size) = @_;
  my $self = $class->SUPER::new(
    undef, -1, $title,
    Wx::Point->new(@$pts),
    Wx::Size->new(@$size),
  );

  # create the menus
  my $menubar = Wx::MenuBar->new();

  my $file_menu = Wx::Menu->new;
  my ($ID_MAKE_PANEL, $ID_EXIT) = 1 .. 1000;

  $file_menu->Append($ID_MAKE_PANEL, "&New\tCtrl+N", "Create a new pan
+el");
  $file_menu->Append($ID_EXIT, "E&xit\tCtrl+X", "Quit");

  $menubar->Append($file_menu, "&File");
  $self->SetMenuBar($menubar);

  use Wx::Event qw( EVT_MENU );

  # uncomment the next line, and a panel is drawn
  # Wx::Panel->new($self);

  # when the "New" menu item is activated, a panel should render
  EVT_MENU($self, $ID_MAKE_PANEL, sub { Wx::Panel->new($self) });
  EVT_MENU($self, $ID_EXIT, sub { $self->Close(1) });

  $self;
}


package main;

MyApp->new->MainLoop();
[download]

The problem is that the panel doesn't render. If, instead, I create the panel right away, it renders. I'm trying to create the panel only when the menu button is pushed.

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