letting the Interface take control

<?php
/* update a progress bar */
$fileProgressBar->set_percentage((float) ($params / $activeDownloadSize));

/* let the interface update */
while(gtk::events_pending()) gtk::main_iteration();
?>
Use callbacks

<?php
    $this->ui->prompt('Are You sure you want to do that?',array(&$this,'isOk'), array(&$this,'isNotOk'));
?>