Windows are toplevel container widgets that are affected by the window manager
parameters, e.g. dialog boxes, popups, application windows, etc.
To set a window's title:
<?php $window->set_title('My App'); ?>
To set the focus widget in the window:
<?php $window->set_focus($name_entry); ?>
To set the default widget in the window (note that the widget has to call
can_default() first):
<?php $window->set_default($ok_button); ?>
To inhibit interaction with other windows in the same app, make it modal,
disallow lowering it below the parent window, and run a new main loop:
<?php
$dialog->set_modal(true);
$dialog->set_transient_for($parent);
gtk::main();
?>
