diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
index 5aa2125c9..52ff5487a 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
@@ -214,6 +214,7 @@ public class TaskComponent extends Div implements AfterCompose {
 
                 // FIXME: Refactorize to another listener
                 updateDeadline();
+                invalidate();
             }
 
         };