<zk>
	<script>
	zk.load('zul.mesh', function () {
	var _meshWidget = {}
	zk.override(zul.mesh.MeshWidget.prototype, _meshWidget, {
		_calcSize: function () {
			zk.log(this.uuid);
			_meshWidget._calcSize.apply(this, arguments); //call the original method
		}
	});
	});
	</script>
	<borderlayout>
		<center flex="true">
			<listbox>
				<listitem label="1" />
				<listitem label="2" />
				<listitem label="3" />
				<listitem label="4" />
			</listbox>
		</center>
	</borderlayout>
</zk>