Index: lams_tool_notebook/src/java/org/lamsfoundation/lams/tool/notebook/dto/NotebookDTO.java
===================================================================
diff -u -r56af73875ad9b4f953d2951479e49dbc1f2715f9 -ra906b0024b44432ea1fe8dc116113542b245c829
--- lams_tool_notebook/src/java/org/lamsfoundation/lams/tool/notebook/dto/NotebookDTO.java	(.../NotebookDTO.java)	(revision 56af73875ad9b4f953d2951479e49dbc1f2715f9)
+++ lams_tool_notebook/src/java/org/lamsfoundation/lams/tool/notebook/dto/NotebookDTO.java	(.../NotebookDTO.java)	(revision a906b0024b44432ea1fe8dc116113542b245c829)
@@ -25,7 +25,6 @@
 
 package org.lamsfoundation.lams.tool.notebook.dto;
 
-import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
 import java.util.TreeSet;
@@ -60,7 +59,7 @@
 
 	public Set<NotebookAttachmentDTO> offlineInstructionsFiles;
 
-	public Set<NotebookSessionDTO> sessionDTOs = new HashSet<NotebookSessionDTO>();
+	public Set<NotebookSessionDTO> sessionDTOs = new TreeSet<NotebookSessionDTO>();
 	
 	/* Constructors */
 	public NotebookDTO(){}