jh: fix bug 178683  exception opening old Examples
diff --git a/plugins/org.eclipse.epf.library.edit/src/org/eclipse/epf/library/edit/util/TngUtil.java b/plugins/org.eclipse.epf.library.edit/src/org/eclipse/epf/library/edit/util/TngUtil.java
index 4671219..f0e1b66 100755
--- a/plugins/org.eclipse.epf.library.edit/src/org/eclipse/epf/library/edit/util/TngUtil.java
+++ b/plugins/org.eclipse.epf.library.edit/src/org/eclipse/epf/library/edit/util/TngUtil.java
@@ -2396,14 +2396,14 @@
 		if (e == null) {
 			return false;
 		}
-		if (e instanceof Example)
-			return true;
-		if (e instanceof ReusableAsset)
-			return true;
+//		if (e instanceof Example)
+//			return true;
+//		if (e instanceof ReusableAsset)
+//			return true;
 		if (e instanceof Template)
 			return true;
-		if (e instanceof Whitepaper)
-			return true;
+//		if (e instanceof Whitepaper)
+//			return true;
 
 		return false;
 	}