diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/GanttPanel.java b/ganttzk/src/main/java/org/zkoss/ganttz/GanttPanel.java
index c184e4f99..335dfe229 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/GanttPanel.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/GanttPanel.java
@@ -141,7 +141,9 @@ public class GanttPanel extends XulElement implements AfterCompose {
         for (Task task : this.tasksLists.getAllTasks()) {
             task.updateTooltipText();
         }
-        invalidate();
+        for (TaskComponent taskComponent : this.tasksLists.getTaskComponents()) {
+            taskComponent.invalidate();
+        }
     }
 
     public TimeTrackerComponent getTimeTrackerComponent() {