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 bfaa7ca25..dafd1fa49 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/resourceload/ResourcesLoadPanel.java
@@ -70,6 +70,14 @@ public class ResourcesLoadPanel extends HtmlMacroComponent {
         registerNeededScripts();
     }
 
+    public void zoomIncrease() {
+        timeTracker.zoomIncrease();
+    }
+
+    public void zoomDecrease() {
+        timeTracker.zoomDecrease();
+    }
+
     public void add(final IToolbarCommand... commands) {
         Component toolbar = getToolbar();
         Separator separator = getSeparator();
diff --git a/ganttzk/src/main/resources/web/ganttz/zul/resourcesLoadLayout.zul b/ganttzk/src/main/resources/web/ganttz/zul/resourcesLoadLayout.zul
index 288a60dfa..24a59c157 100644
--- a/ganttzk/src/main/resources/web/ganttz/zul/resourcesLoadLayout.zul
+++ b/ganttzk/src/main/resources/web/ganttz/zul/resourcesLoadLayout.zul
@@ -19,13 +19,16 @@
 -->
 
 <zk xmlns:n="http://www.zkoss.org/2005/zk/native">
-
+<zscript><![CDATA[
+resourcesLoadPanel = self;
+]]>
+</zscript>
     <borderlayout sclass="resourcesloadlayout" width="auto">
        <north height="30px" border="0">
        <hbox align="center" id="toolbar">
         <separator/>
-        <button label="+" />
-        <button label="-" />
+        <button label="+" onClick="resourcesLoadPanel.zoomIncrease();"/>
+        <button label="-" onClick="resourcesLoadPanel.zoomDecrease();"/>
         From: <datebox /> to: <datebox />
         <separator/>
         Filter: