diff --git a/org.adempiere.ui.zk.example/META-INF/MANIFEST.MF b/org.adempiere.ui.zk.example/META-INF/MANIFEST.MF
index a9d3a4632c..f6edfc3db7 100644
--- a/org.adempiere.ui.zk.example/META-INF/MANIFEST.MF
+++ b/org.adempiere.ui.zk.example/META-INF/MANIFEST.MF
@@ -10,8 +10,10 @@ Import-Package: org.adempiere.base,
  org.adempiere.base.equinox,
  org.adempiere.exceptions,
  org.adempiere.plugin.utils,
+ org.adempiere.util,
  org.adempiere.webui.action,
  org.adempiere.webui.adwindow,
+ org.adempiere.webui.adwindow.validator,
  org.adempiere.webui.apps,
  org.adempiere.webui.component,
  org.adempiere.webui.window,
@@ -24,5 +26,6 @@ Import-Package: org.adempiere.base,
  org.zkoss.zul,
  org.zkoss.zul.event,
  org.zkoss.zul.impl
-Service-Component: OSGI-INF/export.xml
+Service-Component: OSGI-INF/export.xml,
+ OSGI-INF/paymentwindowvalidator.xml 
 Export-Package: action.images
diff --git a/org.adempiere.ui.zk.example/OSGI-INF/paymentwindowvalidator.xml b/org.adempiere.ui.zk.example/OSGI-INF/paymentwindowvalidator.xml
new file mode 100644
index 0000000000..0ee90dd3c8
--- /dev/null
+++ b/org.adempiere.ui.zk.example/OSGI-INF/paymentwindowvalidator.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="org.adempiere.window.payment.validator.PaymentWindowValidator">
+   <implementation class="org.adempiere.window.payment.validator.PaymentWindowValidator"/>
+   <service>
+      <provide interface="org.adempiere.webui.adwindow.validator.WindowValidator"/>
+   </service>
+   <property name="AD_Window_UU" type="String" value="ba895dc4-73df-4cf6-bc29-6dde6e011487"/>
+</scr:component>
diff --git a/org.adempiere.ui.zk.example/build.properties b/org.adempiere.ui.zk.example/build.properties
index 9bc7499535..ed46f7cd6d 100644
--- a/org.adempiere.ui.zk.example/build.properties
+++ b/org.adempiere.ui.zk.example/build.properties
@@ -2,5 +2,6 @@ output.. = bin/
 bin.includes = META-INF/,\
                .,\
                OSGI-INF/export.xml,\
+               OSGI-INF/paymentwindowvalidator.xml,\
                OSGI-INF/
 source.. = src/
diff --git a/org.adempiere.ui.zk.example/src/org/adempiere/window/payment/validator/PaymentWindowValidator.java b/org.adempiere.ui.zk.example/src/org/adempiere/window/payment/validator/PaymentWindowValidator.java
new file mode 100644
index 0000000000..84ce91ca52
--- /dev/null
+++ b/org.adempiere.ui.zk.example/src/org/adempiere/window/payment/validator/PaymentWindowValidator.java
@@ -0,0 +1,21 @@
+package org.adempiere.window.payment.validator;
+
+import org.adempiere.util.Callback;
+import org.adempiere.webui.adwindow.validator.WindowValidator;
+import org.adempiere.webui.adwindow.validator.WindowValidatorEvent;
+import org.adempiere.webui.adwindow.validator.WindowValidatorEventType;
+import org.adempiere.webui.window.FDialog;
+
+public class PaymentWindowValidator implements WindowValidator {
+
+	@Override
+	public void onWindowEvent(WindowValidatorEvent event,
+			Callback<Boolean> callback) {
+		if (event.getName().equals(WindowValidatorEventType.BEFORE_PRINT.getName())) {
+			FDialog.ask(event.getWindow().getADWindowContent().getWindowNo(), 
+					event.getWindow().getComponent(), "Print ?", callback);
+		} else {
+			callback.onCallback(Boolean.TRUE);
+		}
+	}
+}
\ No newline at end of file