      }
  
      /**
-Index: src/java/org/dellroad/stuff/vaadin/SimpleItem.java
-===================================================================
---- src/java/org/dellroad/stuff/vaadin/SimpleItem.java	(revision 387)
-+++ src/java/org/dellroad/stuff/vaadin/SimpleItem.java	(working copy)
-@@ -91,7 +91,7 @@
-      * @throws UnsupportedOperationException always
-      */
+Index: src/java/org/dellroad/stuff/vaadin/AbstractSimpleContainer.java
+===================================================================
+--- src/java/org/dellroad/stuff/vaadin/AbstractSimpleContainer.java	(revision 389)
++++ src/java/org/dellroad/stuff/vaadin/AbstractSimpleContainer.java	(working copy)
+@@ -208,7 +208,7 @@
+     }
+ 
      @Override
--    public boolean addItemProperty(Object id, Property property) {      // TODO: VAADIN7
-+    public boolean addItemProperty(Object id, Property/*<?>*/ property) {
-         throw new UnsupportedOperationException();
-     }
- 
+-    public Property getContainerProperty(Object itemId, Object propertyId) {        // TODO: VAADIN7
++    public Property<?> getContainerProperty(Object itemId, Object propertyId) {
+         SimpleItem<T> entityItem = this.getItem(itemId);
+         if (entityItem == null)
+             return null;
 Index: src/java/org/dellroad/stuff/vaadin/SpringContextApplication.java
 ===================================================================
---- src/java/org/dellroad/stuff/vaadin/SpringContextApplication.java	(revision 387)
+--- src/java/org/dellroad/stuff/vaadin/SpringContextApplication.java	(revision 388)
 +++ src/java/org/dellroad/stuff/vaadin/SpringContextApplication.java	(working copy)
 @@ -127,7 +127,7 @@
   * @see <a href="https://github.com/archiecobbs/dellroad-stuff-vaadin-spring-demo3">Example Code on GitHub</a>

         <dependency force="true" org="javax.validation" name="validation-api" rev="1.0.0.GA" conf="build->default"/>
Index: build.xml
===================================================================
--- build.xml	(revision 387)
+++ build.xml	(working copy)
@@ -169,7 +169,7 @@
                 <link href="http://static.springsource.org/spring/docs/3.0.x/javadoc-api/"/>

 
     /**
      * Perform any application-specific shutdown work. This will be invoked at shutdown after this Vaadin application and the
Index: src/java/org/dellroad/stuff/vaadin/SimpleProperty.java
===================================================================
--- src/java/org/dellroad/stuff/vaadin/SimpleProperty.java	(revision 388)
+++ src/java/org/dellroad/stuff/vaadin/SimpleProperty.java	(working copy)
@@ -23,7 +23,7 @@
  * @see SimpleItem
