Fatal error: Call to undefined method Gdk::screen_width()

I have the php-gtk-2.0.0 Windows binary pack - 29-Feb-2008 installed with PHP 5.2.5 I am getting the error "Fatal error: Call to undefined method Gdk::screen_width()" I am using code from Pro PHP-GTK by Scott Mattocks downloaded from his website. In any of the scripts that perform a Gdk::screen_width() I get the above error. I have the location of php-gtk2 in my path statement. Please help me with this problem. Thanks David Hurley One of the scripts with the problem: <?php /** * Script to run our application. */ class Crisscott_SplashScreen extends GtkWindow { // A widget to show a status message. public $status; public function __construct() {

       // Call the parent constructor.
       parent::__construct();

       // Turn off the window borders.
       $this->set_decorated(false);

       // Set the background color to white.
       $style = $this->style->copy();
       $style->bg[Gtk::STATE_NORMAL] = $style->white;
       $this->set_style($style);

       // Move the window to the center of the screen.
       $this->set_uposition(Gdk::screen_width() / 2, Gdk::screen_height() / 2);
       // Call a helper method to create the pieces of the splash screen.
       $this->_populate();

       // Set up the application to shutdown cleanly.
       $this->connect_object('destroy', array('Gtk', 'main_quit'));

} private function _populate() {

       // Create the containers.
       $frame     = new GtkFrame();
       $hBox      = new GtkHBox();
       $vBox      = new GtkVBox();
             // Set the shadow type.
       $frame->set_shadow_type(Gtk::SHADOW_ETCHED_OUT);

       // Create title label.
       $titleText = '<span foreground="#000060"><b>Crisscott ' .
           'Product Information Management System</b></span>';
       $title = new GtkLabel($titleText);
       // Use markup to make the label blue and bold.
       $title->set_use_markup(true);

       // Create an initial status message.
       $this->status = new GtkLabel('Initializing Main Window');
             // Stack the labels vertically.
       $vBox->pack_start($title,        true, true, 10);
       $vBox->pack_start($this->status, true, true, 10);

       // Add a logo image.
       $logoImg = GtkImage::new_from_file('Crisscott/images/logo.png');

       // Put the image and the first box next to each other.
       $hBox->pack_start($logoImg, false, false, 10);
       $hBox->pack_start($vBox,    false, false, 10);

       // Put everything inside a frame.
       $frame->add($hBox);

       // Put the frame inside the window.
       $this->add($frame);

} public function start() {

       $this->show_all();
       Gtk::main();

} } $splash = new Crisscott_SplashScreen(); $splash->start(); /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * End: */ ?>