diff --git a/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java b/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
index 3bf9848de..e55526408 100644
--- a/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
+++ b/designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java
@@ -843,8 +843,10 @@ public class EastRegionContainerPane extends UIEastResizableContainer {
         }
 
         public void replaceContentPane(JComponent pane) {
-            contentArea.remove(this.contentPane);
-            contentArea.add(this.contentPane = pane);
+            if (pane != this.contentPane) {
+                contentArea.remove(this.contentPane);
+                contentArea.add(this.contentPane = pane);
+            }
             if (popupDialog != null && isPoppedOut) {
                 popupDialog.replaceContentPane(this);
             }