diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/common/ComponentsReplacer.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/ComponentsReplacer.java
new file mode 100644
index 000000000..7c0a924a8
--- /dev/null
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/ComponentsReplacer.java
@@ -0,0 +1,73 @@
+/*
+ * This file is part of ###PROJECT_NAME###
+ *
+ * Copyright (C) 2009 Fundación para o Fomento da Calidade Industrial e
+ *                    Desenvolvemento Tecnolóxico de Galicia
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.navalplanner.web.common;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.zkoss.zk.ui.Component;
+import org.zkoss.zk.ui.Executions;
+
+public class ComponentsReplacer {
+
+    private static class ChildrenSnapshot implements IChildrenSnapshot {
+        private final List<Component> children;
+        private final Component parent;
+
+        public ChildrenSnapshot(Component parent,
+                List<Component> currentChildren) {
+            this.parent = parent;
+            this.children = currentChildren;
+        }
+
+        @Override
+        public IChildrenSnapshot restore() {
+            List<Component> removedChildren = removeChildren(parent);
+            parent.getChildren().addAll(children);
+            return new ChildrenSnapshot(parent, removedChildren);
+        }
+    }
+
+    /**
+     * @param parent
+     * @param script
+     * @param arguments
+     * @return
+     */
+    public static IChildrenSnapshot replaceAllChildren(Component parent,
+            String script,
+            Map<String, Object> arguments) {
+        List<Component> currentChildren = removeChildren(parent);
+        ChildrenSnapshot result = new ChildrenSnapshot(parent, currentChildren);
+        Executions.createComponents(script, parent, arguments);
+        return result;
+    }
+
+    private static List<Component> removeChildren(Component parent) {
+        List<Component> currentChildren = new ArrayList<Component>(parent
+                .getChildren());
+        for (Component c : currentChildren) {
+            c.detach();
+        }
+        return currentChildren;
+    }
+
+}
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/common/IChildrenSnapshot.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/IChildrenSnapshot.java
new file mode 100644
index 000000000..511354d3c
--- /dev/null
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/common/IChildrenSnapshot.java
@@ -0,0 +1,28 @@
+/*
+ * This file is part of ###PROJECT_NAME###
+ *
+ * Copyright (C) 2009 Fundación para o Fomento da Calidade Industrial e
+ *                    Desenvolvemento Tecnolóxico de Galicia
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.navalplanner.web.common;
+
+public interface IChildrenSnapshot {
+    /**
+     * Restores the children that were current in a point in time
+     * @return a snapshot of the children that will be replaced
+     */
+    public IChildrenSnapshot restore();
+}
\ No newline at end of file