TOBAGO-224 ( validation of tree works incorrect)
diff --git a/core/src/main/java/org/apache/myfaces/tobago/component/UITreeOld.java b/core/src/main/java/org/apache/myfaces/tobago/component/UITreeOld.java
index 5395750..ede46c6 100644
--- a/core/src/main/java/org/apache/myfaces/tobago/component/UITreeOld.java
+++ b/core/src/main/java/org/apache/myfaces/tobago/component/UITreeOld.java
@@ -313,6 +313,7 @@
 
       for (DefaultMutableTreeNode node : selection) {
         if (!node.isLeaf()) {
+          setValid(false);
           FacesMessage facesMessage = MessageFactory.createFacesMessage(
               context, MESSAGE_NOT_LEAF, FacesMessage.SEVERITY_ERROR);
           context.addMessage(getClientId(context), facesMessage);