diff --git a/designer_base/src/com/fr/design/mainframe/EastRegionContainerPane.java b/designer_base/src/com/fr/design/mainframe/EastRegionContainerPane.java
index c5f81a9d8..cfc34633f 100644
--- a/designer_base/src/com/fr/design/mainframe/EastRegionContainerPane.java
+++ b/designer_base/src/com/fr/design/mainframe/EastRegionContainerPane.java
@@ -643,6 +643,7 @@ public class EastRegionContainerPane extends UIEastResizableContainer {
                     setTabButtonSelected();
                 }
             });
+            button.setToolTipText(title);
         }
 
         public UIButton getButton() {