<zk>
	<vbox apply="org.zkoss.bind.BindComposer"
		viewModel="@id('vm') @init('org.zkoss.zktest.bind.viewmodel.form.Form')"
		width="400px">
		<div form="@id('fx') @load(vm.order) @save(vm.order, before='compute')">
			<textbox value="@bind(fx.name) @converter(vm.myConverter, key1=fx.name, key2='value2')" />
			<button id="computeButton" label="Compute" onClick="@command('compute')" />

		</div>
	</vbox>
</zk>

package org.zkoss.zktest.bind.viewmodel.form;

import org.zkoss.bind.BindContext;
import org.zkoss.bind.Converter;
import org.zkoss.bind.annotation.Command;
import org.zkoss.zk.ui.Component;


public class Form{

	
	public class Order{
		private String name = "default name";

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}

	}
	
	
	private Order order = new Order();
	
	public Order getOrder() {
		return order;
	}
	
	
	public Converter getMyConverter(){
		return new Converter() {
			
			public Object coerceToUi(Object val, Component component, BindContext ctx) {
				String value1 = (String)ctx.getConverterArg("key1");
				String value2 = (String)ctx.getConverterArg("key2");
				System.out.println("to UI, myKey:"+value1);
				System.out.println("to UI, Key2:"+value2);
				return val;
			}
			
			public Object coerceToBean(Object val, Component component, BindContext ctx) {
				String value1 = (String)ctx.getConverterArg("key1");
				String value2 = (String)ctx.getConverterArg("key2");
				System.out.println("to bean, myKey:"+value1);
				System.out.println("to bean, Key2:"+value2);
				return val;
			}
		};
	}
	
	// -----------command -----------------
	@Command 
	public void compute(){
		
	}


}