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     1.1 --- a/modules/lib.charting/src/org/aiotrade/lib/charting/view/ChartView.scala	Sun Nov 08 05:39:49 2009 +0800
     1.2 +++ b/modules/lib.charting/src/org/aiotrade/lib/charting/view/ChartView.scala	Sun Nov 08 05:59:46 2009 +0800
     1.3 @@ -599,7 +599,9 @@
     1.4        }
     1.5  
     1.6        /** precess event's call back */
     1.7 -      evt.callBack()
     1.8 +      if (evt.callBack != null) {
     1.9 +        evt.callBack()
    1.10 +      }
    1.11      }
    1.12    }
    1.13  }