update

designer-base/src/main/java/com/fr/design/mainframe/WestRegionContainerPane.java

@@ -42,9 +42,9 @@ public class WestRegionContainerPane extends UIResizableContainer {
 
                 if (getDownPane() != null) {
                     replaceDownPane(TableDataTreePane.getInstance(DesignModelAdapter.getCurrentModelAdapter()));
+                } else {
+                    setDownPane(TableDataTreePane.getInstance(DesignModelAdapter.getCurrentModelAdapter()));
                 }
-
-                setDownPane(TableDataTreePane.getInstance(DesignModelAdapter.getCurrentModelAdapter()));
             }
         }, new PluginFilter() {