diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java b/ganttzk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
index 144ef6ec9..586597622 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/util/MutableTreeModel.java
@@ -233,4 +233,14 @@ public class MutableTreeModel<T> extends AbstractTreeModel {
         return associatedNode.isRoot();
     }
 
+    public void replace(T nodeToRemove, T nodeToAdd) {
+        T parent = getParent(nodeToRemove);
+        Node<T> parentNode = find(parent);
+        final int insertionPosition = parentNode.getIndexOf(find(nodeToRemove));
+        remove(nodeToRemove);
+        List<T> toAdd = new ArrayList<T>();
+        toAdd.add(nodeToAdd);
+        add(parent, insertionPosition, toAdd);
+    }
+
 }
diff --git a/ganttzk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java b/ganttzk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
index e3836d5d3..e571251aa 100644
--- a/ganttzk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
+++ b/ganttzk/src/test/java/org/zkoss/ganttz/util/MutableTreeModelTest.java
@@ -317,6 +317,23 @@ public class MutableTreeModelTest {
                 TreeDataEvent.INTERVAL_REMOVED, model.getRoot(), 0);
     }
 
+    @Test
+    public void aNodeCanBeReplacedByOther() {
+        final MutableTreeModel<Prueba> model = MutableTreeModel
+                .create(Prueba.class);
+        Prueba toRemove = new Prueba();
+        Prueba prueba2 = new Prueba();
+        Prueba grandChild = new Prueba();
+        model.add(model.getRoot(), toRemove);
+        model.add(model.getRoot(), prueba2);
+        model.add(toRemove, grandChild);
+        Prueba substitution = new Prueba();
+        model.replace(toRemove, substitution);
+
+        assertThat(model.getChildCount(substitution), equalTo(0));
+        assertThat(model.getChild(model.getRoot(), 0), equalTo(substitution));
+    }
+
     private void checkIsValid(TreeDataEvent event, int type,
             Prueba expectedParent, int expectedPosition) {
         checkIsValid(event, type, expectedParent, expectedPosition,