Default index of Listbox with Template tag

package foo;
import java.io.Serializable;

public class Test implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = -3121205098864452889L;

	private int id;
	private String text;
	
	public Test(int id, String text){
		this.id = id;
		this.text = text;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getText() {
		return text;
	}

	public void setText(String text) {
		this.text = text;
	}
	
}

<?page title="Auto Generated index.zul"?>
<window title="Hello World!!" border="normal" width="200px">

<listbox id="listbox" mold="select">
	<template name="model">
		<listitem label="${each.text}" selected="${each.id == 1}"/>
	</template>
</listbox>

<button label="click me" onClick="System.out.println(listbox.getSelectedIndex())"/>

<zscript>
		ListModelList model = new ListModelList();
		listbox.setModel(model);
		model.add(new foo.Test(1,"test1"));
		model.add(new foo.Test(2,"test2"));
		model.add(new foo.Test(3,"test3"));
		model.add(new foo.Test(4,"test4"));
		model.add(new foo.Test(5,"test5"));
</zscript>
</window>