public class MyViewModel implements Serializable {

	private String msg;
	
	@Init
	public void init() {

	}

	
	
	@Command
	@NotifyChange("msg")
	public void doLoginUser() {
		msg = "Login User" + new Date();
	}
	
	public String getMsg() {
		return msg;
	}
	
}

<zk>
	<window apply="org.zkoss.bind.BindComposer" 
		viewModel="@id('vm')@init('org.zkoss.test.cluster.ZKClusterMVVM.MyViewModel')"
		title="Hello Spring Secuirty" border="normal"
		width="400px">
		<vlayout>
			<button label="click (need to login otherwise will not bind event)" 
				onClick="@command('doLoginUser')"></button>
			<groupbox>
				<caption label="massage"/>
				<label value="@load(vm.msg)"/>
			</groupbox>
		</vlayout>
		
	</window>
</zk>