the XXXwindow.onClose fail to work when call the Onclose function in a messagebox event listner

<?page title="artilcelist" contentType="text/html;charset=UTF-

8"?>
<?taglib uri="http://www.zkoss.org/dsp/web/core" prefix="c"?>
<zk>
	<window border="none" width="900px" height="500px" 

id="testWindow"
		use="zk.test.TestCtrl">
		<style>
			body { padding: 0 0; /* 0 padding on top and 

bottom and 0
			padding on right and left */ }
		</style>
		<borderlayout>
			<center flex="true" border="normal">
				<borderlayout height="100%" 

width="100%">
					<west collapsible="true" 

width="150px">
						<div>
							<button 

id="btnAdd" label="OpenDialog"></button>
						</div>
					</west>
					<center>
						<div height="100%">
							<paging 

id="paging_ArticleList" />
							<listbox 

id="lbxArticleList" width="100%"
								

height="100%" vflex="true" multiple="true">
								

<listhead sizable="true">
									

<listheader
									

	id="listheader_Article_id" sort="auto" width="5%" label="id" 

/>
									

<listheader
									

	id="listheader_Article_title" sort="auto" width="35%"
									

	label="title" />
									

<listheader
									

	id="listheader_Article_class" sort="auto" width="10%"
									

	label="class" />
									

<listheader
									

	id="listheader_Article_addTime" sort="auto" width="10%"
									

	label="add time" />
								

</listhead>
								

<listitem id="item1">
									

<listcell>1</listcell>
									

<listcell>title1</listcell>
									

<listcell>class1</listcell>
									

<listcell>add time1</listcell>
								

</listitem>
								

<listitem id="item2">
									

<listcell>2</listcell>
									

<listcell>title2</listcell>
									

<listcell>class2</listcell>
									

<listcell>add time2</listcell>
								

</listitem>
								

<listitem id="item3">
									

<listcell>3</listcell>
									

<listcell>title3</listcell>
									

<listcell>class3</listcell>
									

<listcell>add time3</listcell>
								

</listitem>
								

<listitem id="item4">
									

<listcell>4</listcell>
									

<listcell>title4</listcell>
									

<listcell>class4</listcell>
									

<listcell>add time4</listcell>
								

</listitem>
								

<listitem id="item5">
									

<listcell>5</listcell>
									

<listcell>title5</listcell>
									

<listcell>class5</listcell>
									

<listcell>add time5</listcell>
								

</listitem>
							</listbox>
						</div>
					</center>
				</borderlayout>
			</center>
		</borderlayout>
	</window>
</zk>

package zk.test;

import java.io.Serializable;

import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zul.Button;
import org.zkoss.zul.Window;

import cn.ipow.frontend.webui.util.BaseCtrl;

public class TestCtrl extends BaseCtrl implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = -

8872141711397093531L;
	private transient Window testWindow;
	private transient Button btnAdd;

	public void onCreate$articleListWindow(Event event) throws 

Exception {
		doOnCreateCommon(testWindow);// autowire
	}
	//click event,open a window
	public void onClick$btnAdd(Event event) throws Exception {

		Window win = null;
		try {
			win = (Window) Executions.createComponents

("/openDialog.zul", null,
					null);
		} catch (Exception e) {

			if (win != null) {
				win.detach();
			}

		}
	}
}

<?page title="new page title" 

contentType="text/html;charset=UTF-8"?>
<zk>
	<window id="openDialogWindow" title="new page title" 

width="500px"
		height="300px" border="normal" closable="true"
		use="zk.test.OpenDialogCtrl">
		New Content Here!
		<button id="btnSave" label="Save"></button>
		<button id="btnClose" label="Close"></button>
	</window>
</zk>

package zk.test;

import java.io.Serializable;

import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zul.Button;
import org.zkoss.zul.Messagebox;
import org.zkoss.zul.Window;

import cn.ipow.frontend.webui.util.BaseCtrl;
import cn.ipow.frontend.webui.util.MultiLineMessageBox;

public class OpenDialogCtrl extends BaseCtrl implements Serializable {
	private transient Window openDialogWindow;
	protected transient Button btnSave;
	protected transient Button btnClose;

	public void onCreate$openDialogWindow(Event event) throws 

Exception {
		openDialogWindow.doModal(); // open the dialog in 

modal mode
	}

	public void onClick$btnSave(Event event) throws 

InterruptedException {
		if (Messagebox
				.show(
						"add success,choose ok 

to continue,choose no to close current window",
						"Notice", 

Messagebox.YES | Messagebox.NO,
						"z-msgbox z-msgbox-

question", new EventListener() {
							public void 

onEvent(Event evt) {

								switch 

(((Integer) evt.getData()).intValue()) {
								case 

Messagebox.YES:
									

// doClear();
									

break;
								case 

Messagebox.NO:
									

doClose();
									

break;
								}
							}

						}) == Messagebox.YES) 

{
		}
	}

	protected void doClose() {
		openDialogWindow.onClose();
	}

	public void onClick$btnClose(Event event) {
		doClose();
	}
}