gtk_window_set_decorated() function doesn't work

["Andrew E. Makeev" <andrew solvo ru>]

Hello.

After installing Gtk+-2.8 packages on Win32 I found that my toplevel 
window won't lose it's title bar and borders when

gtk_window_set_decorated( GTK_WINDOW( win ), FALSE );

function called. (It worked well for Gtk+-2.4).
Help file says that function should always work on Win32.

Any comments?

Regards,
-andrew

#include <gtk/gtkmain.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtkvbox.h>
#include <gtk/gtkbutton.h>

GtkWidget* create_app()
{
    GtkWidget* window;
    GtkWidget* box;
    GtkWidget* button;

    window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    gtk_window_set_decorated( GTK_WINDOW( window ), FALSE );

    box = gtk_vbox_new( FALSE, 0 );
    gtk_container_add( GTK_CONTAINER( window ), box );
    gtk_widget_show( box );

    button = gtk_button_new_with_label( "BUTTON" );
    gtk_box_pack_start( GTK_BOX( box ), button, TRUE, FALSE, 2 );
    gtk_widget_show( button );

    return window;
}

int main( int argc, char* argv[] )
{
    GtkWidget* app;

    gtk_init( &argc, &argv );

    app = create_app();
    g_signal_connect( G_OBJECT( app ), "destroy", G_CALLBACK( gtk_main_quit ), NULL );
    gtk_widget_show( app );

    gtk_main();

    return 0;
}