public IResourceURLFactory GetURLFactory(Control control)
		{
			if (_factory == null) _factory = new HttpHandlerURLFactory(control.Page.Request.ApplicationPath);
			return _factory;
		}
		public IResourceURLFactory GetURLFactory(HttpContext context)
		{
			if (_factory == null) _factory = new HttpHandlerURLFactory(context.Request.ApplicationPath);
			return _factory;
		}