uiKLineTool.py不显示K线的解决方法

uiKLineTool.py文件的
```
        print u'正在准备回测结果数据....'
        self.canvas.clearData()
        self.pdBars = data[['open','close','low','high','volume','openInterest']]
        self.canvas.loadData(self.pdBars)
        self.canvas.updateSig(self.signals)
```
后面插入一行
```
self.canvas.refreshAll()
```
就可以了