diff --git a/designer_chart/src/com/fr/design/chart/fun/impl/AbstractIndependentChartUI4Custom.java b/designer_chart/src/com/fr/design/chart/fun/impl/AbstractIndependentChartUI4Custom.java
index ce65ddb86c..1af79ea39f 100644
--- a/designer_chart/src/com/fr/design/chart/fun/impl/AbstractIndependentChartUI4Custom.java
+++ b/designer_chart/src/com/fr/design/chart/fun/impl/AbstractIndependentChartUI4Custom.java
@@ -82,4 +82,9 @@ public abstract class AbstractIndependentChartUI4Custom implements IndependentCh
         return getPlotTypePane().title4PopupWindow();
     }
 
+    @Override
+    public int currentAPILevel() {
+        return CURRENT_API_LEVEL;
+    }
+
 }
\ No newline at end of file