Not an event name problem

<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit"?>

<window id="win" title="To do list" width="1000px"  border="normal" apply="com.ercan.todolist.EventController">
	<listbox id="box" multiple="true"    rows="5" model="@{win$composer.AllProducts, load-after='add.onClick, delete.onClick, update.onClick , calculate.onClick'}" 
		selectedItem="@{win$composer.current}">
		<listhead>
			<listheader label="Product_Name" />
			<listheader label="Category" width="50px" />
			<listheader label="Quant" width="50px" />
			<listheader label="Date" width="90px" />
		</listhead>		
		<listitem self="@{each='event'}" value="@{event}">			
			<listcell label="@{event.name}" />
			<listcell label="@{event.cat}" />
			<listcell label="@{event.quant}" />
			<listcell label="@{event.date}" />
			
			

		</listitem>
	
	</listbox>
	
	<checkbox  id="a" label="deneme" forward="onCheck=win.doCheck"/>
	
		
	<groupbox>
		<caption label="Event" />
		Name: <textbox id="name" cols="25" value="@{win$composer.current.name}" />
		Category: <textbox id="cat" cols="25" value="@{win$composer.current.cat}" />
		Quant: <intbox id="quant" cols="1" value="@{win$composer.current.quant}" />
		Date: <datebox id="date" cols="8" value="@{win$composer.current.date}" />
		
		<button id="add" label="Add" width="36px" height="24px"/>
		<button id="update" label="Update" width="46px" height="24px"/>
		<button id="delete" label="Delete" width="46px" height="24px"/>
		<button id="calculate" label="Calculate" width="46px" height="24px"/>
	</groupbox>	
</window>

package com.ercan.todolist;

import java.util.List;
import java.util.UUID;

import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.ForwardEvent;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.api.Checkbox;

public class EventController extends GenericForwardComposer {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	Product current = new Product();
	ProductEvent prodevt = new ProductEvent();
	Listbox box;

	public Product getCurrent() {
		return current;
	}

	public void setCurrent(Product current) {
		this.current = current;
	}

	public List getAllProducts() {

		return prodevt.showAll();

	}

	public void onClick$add() {
		System.out.println("called ADD");
		Product newProd = new Product(current.getName(), current.getCat(),
				current.getQuant(), current.getDate());
		prodevt.insert(newProd);
	}

	public void onClick$update() {
		System.out.println("called Update");
		if (box.getSelectedItem() != null) {

			prodevt.update((Product) box.getSelectedItem().getValue());

		}

	}

	public void onClick$delete() {

		if (box.getSelectedItem() != null) {

			prodevt.delete((Product) box.getSelectedItem().getValue());

		}

	}

	public void onClick$calculate() {

		if (box.getSelectedItem() != null) {
			System.out.println("calculating");
			prodevt.calculate(box.getItems());
			System.out.println("sendedt to calculate functýon ");

		}

	}

	public void doCheck(ForwardEvent event) {

		Event orig = event.getOrigin();
		System.out.println("here " + orig);

	}

}