/**
* Returns the DeviceManager object
*
* @param boolean $initialize (opt) default true: initializes the DeviceManager if not already done
*
* @access public
* @return object DeviceManager
*/
public static function GetDeviceManager($initialize = true)
{
if (!isset(ZPush::$deviceManager) && $initialize) {
ZPush::$deviceManager = new DeviceManager();
}
return ZPush::$deviceManager;
}