wx::dialog and movexy broken?

[jeff]

Have some odd behavior here.  
Here is a test simple script. It simple opens and closes a non modal
dialog by click a button on the main window.

On the 1st click it will open the dialog at the requested location. 
Click the button a 2nd time and it will close.
Click it a 3rd time and it will center on parent - hiding  the main
window.
Move it aside.
Click it a 4th time and it will close.
Click it a 5th time and it will open at the requested location.
And on and on., alternating between the two positions.

The line of interest is ~ line 50.
Having this behavior in many locations in real code :-(

Anyone have any ideas?   Hopefully we're just being stupid  ;-)

Jeff

##################################### CUT HERE
#################################
use strict;
use Wx;
###########################################################
#
# Extend the Frame class to our needs
#
package MyFrame;

use Wx::Event qw( EVT_BUTTON );
use Wx qw/:everything/;

use base qw/Wx::Frame/; # Inherit from Wx::Frame

sub new
{
my $class = shift;

my $self = $class->SUPER::new(@_);  # call the superclass' constructor

# Then define a Panel to put the button on
my $panel = Wx::Panel->new( $self,  # parent
-1      # id
);

my $BTNID = 1;  # store the id of the button in $BTNID

$self->{btn} = Wx::Button->new(     $panel,             # parent
$BTNID,             # ButtonID
">>> Press me <<<", # label
[50,50]             # position
);

EVT_BUTTON( $self,          # Object to bind to
$BTNID,         # ButtonID
\&ButtonClicked # Subroutine to execute
);

$self->{dialog} = Wx::Dialog->new($self, -1, "test dialog");
$self->{dialog_state}=0;

return $self;
}

sub ButtonClicked 
{ 
my( $self, $event ) = @_; 

if($self->{dialog_state}==0){
        $self->{dialog}->Move(100, 100);
        $self->{dialog}->Show(1);
        $self->{dialog_state}=1;
}
else{
        $self->{dialog}->Show(0);
        $self->{dialog_state}=0;
}
} 

###########################################################
#
# Define our ButtonApp2 class that extends Wx::App
#
package ButtonApp2;

use base qw(Wx::App);   # Inherit from Wx::App

sub OnInit
{
my $self = shift;
my $frame = MyFrame->new(   undef,         # Parent window
-1,            # Window id
'Button interaction example', # Title
[300,400],         # position X, Y
[200, 150]     # size X, Y
);
$self->SetTopWindow($frame);    # Define the toplevel window
$frame->Show(1);                # Show the frame
}

###########################################################
#
# The main program
#
package main;

my $wxobj = ButtonApp2->new(); # New ButtonApp application
$wxobj->MainLoop;