diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
index 8227ae8d5..c1b917a11 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/resourceload/LoadTimeLine.java
@@ -30,7 +30,7 @@ import org.apache.commons.lang.Validate;
 import org.joda.time.LocalDate;
 import org.zkoss.ganttz.util.Interval;
 
-public class LoadTimeLine {
+public class LoadTimeLine implements Comparable<LoadTimeLine>{
 
     private final String conceptName;
     private final List<LoadPeriod> loadPeriods;
@@ -196,4 +196,13 @@ public class LoadTimeLine {
         return result;
     }
 
-}
+    public String toString() {
+        return conceptName;
+    }
+
+    @Override
+    public int compareTo(LoadTimeLine o) {
+        return conceptName.compareTo(o.getConceptName());
+    }
+
+}
\ No newline at end of file
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java b/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java
index 655b14069..a4d91ec02 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java
@@ -23,7 +23,10 @@ package org.zkoss.ganttz.resourceload;
 
 import static org.zkoss.ganttz.i18n.I18nHelper._;
 
+import java.util.ArrayList;
 import java.util.List;
+import java.util.SortedSet;
+import java.util.TreeSet;
 
 import org.apache.commons.lang.StringUtils;
 import org.joda.time.LocalDate;
@@ -294,9 +297,33 @@ public class ResourcesLoadPanel extends HtmlMacroComponent {
             result.addToRoot(loadTimeLine);
             result = addNodes(result, loadTimeLine);
         }
+        return sortModelTree(result);
+    }
+
+    private MutableTreeModel<LoadTimeLine> sortModelTree(MutableTreeModel<LoadTimeLine> modelForTree) {
+        LoadTimeLine root = modelForTree.getRoot();
+        MutableTreeModel<LoadTimeLine> result = MutableTreeModel.create(LoadTimeLine.class, root);
+        sortModelTree(result, modelForTree, root);
         return result;
     }
 
+    private void sortModelTree(MutableTreeModel<LoadTimeLine> result,
+            MutableTreeModel<LoadTimeLine> source, LoadTimeLine parent) {
+        List<LoadTimeLine> children = getChildrenInOrderFor(source, parent);
+        result.add(parent, children);
+        for (LoadTimeLine each: children) {
+            sortModelTree(result, source, each);
+        }
+    }
+
+    private List<LoadTimeLine> getChildrenInOrderFor(
+            MutableTreeModel<LoadTimeLine> modelForTree, LoadTimeLine parent) {
+        SortedSet<LoadTimeLine> result = new TreeSet<LoadTimeLine>();
+        for (int i = 0; i < modelForTree.getChildCount(parent); i++) {
+            result.add(modelForTree.getChild(parent, i));
+        }
+        return new ArrayList<LoadTimeLine>(result);
+    }
 
     private MutableTreeModel<LoadTimeLine> addNodes(
             MutableTreeModel<LoadTimeLine> tree, LoadTimeLine parent) {