adding hbox example

03c2-box-model/HBoxExample.mxml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
+    backgroundColor="#FFFFFF"
+    backgroundAlpha="0">
+
+    <mx:HBox>
+
+        <mx:Button label="&lt; prev"
+            left="10" top="120" />
+
+        <mx:Image source="assets/animals03.jpg"
+            horizontalCenter="0" top="30"/>
+
+        <mx:Label text="Photographed by Elsie Weil"
+            horizontalCenter="0" top="250"/>
+
+        <mx:Button label="next &gt;"
+            right="10" top="120"/>
+
+    </mx:HBox>
+
+</mx:Application>