Changing theme on the fly tutorial code

Tutorial published at
https://vaadin.com/wiki/-/wiki/Main/Changing+theme+on+the+fly

Change-Id: I41e024001e0f4747ff38b9d9c365771f87e2d2cb

diff --git a/uitest/src/com/vaadin/tests/minitutorials/v7_3/ThemeChangeUI.java b/uitest/src/com/vaadin/tests/minitutorials/v7_3/ThemeChangeUI.java
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+++ b/uitest/src/com/vaadin/tests/minitutorials/v7_3/ThemeChangeUI.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.minitutorials.v7_3;
+
+import java.util.Arrays;
+
+import com.vaadin.data.Property.ValueChangeEvent;
+import com.vaadin.data.Property.ValueChangeListener;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.ui.ComboBox;
+import com.vaadin.ui.UI;
+
+public class ThemeChangeUI extends UI {
+
+    private String[] themes = { "valo", "reindeer", "runo", "chameleon" };
+
+    @Override
+    protected void init(VaadinRequest request) {
+        ComboBox themePicker = new ComboBox("Theme", Arrays.asList(themes));
+        themePicker.setValue(getTheme());
+
+        themePicker.addValueChangeListener(new ValueChangeListener() {
+            @Override
+            public void valueChange(ValueChangeEvent event) {
+                String theme = (String) event.getProperty().getValue();
+                setTheme(theme);
+            }
+        });
+
+        setContent(themePicker);
+    }
+}