How to get Textbox value which is child of Listcell?????

I have to create textboxes dynamically in ListBox. But I unable to get value of Textbox. Following is the code.

Listcell cell=new Listcell();
Listcell cell2=new Listcell();
Button b1=new Button();
b1.setLabel("Schedule");
b1.addEventListener("onClick", new ClickListener(li));
b1.setParent(cell);
li.appendChild(cell);
Textbox t1=new Textbox();
t1.setValue("@{unit_c.itemunitcode}");
t1.setParent(cell2);
li.appendChild(cell2);
lst_reqitems.appendChild(li);
......
.....

import org.zkoss.zk.ui.event.EventListener;
final class ClickListener implements EventListener 
{ 
        Listitem item;
	ClickListener(Listitem selitem)
	{
		item=selitem;
	}
	
        public void onEvent(Event event) throws UiException 
	{ 
		try{ 
			alert("generated..."+item.getChildren().get(1).getLabel());
			setreq_items(item);
		} 
		catch(Exception e) 
		{ 
			//System.out.println("Error plz select proper item "+e);
			alert("Error plz select proper item "+e);
		} 
	} 
}