该版本修正的bug有：
- ZIndex property of DataSeries was not behaving as expected on real-time update.
改进内容：
- New property ScrollBarScale has been introduced at Axis element.
ScrollBarScale sets the size of ScrollBar Thumb. For example, if
ScrollBarScale is set to 0.5, width of ScrollBar Thumb will be half of
the ScrollBar width which in turn increases the PlotArea width to
double the actual width of PlotArea. It takes values from 0.1 to 1.
- In Pie/Doughnut chart, if DataPoint has YValue property set to 0, label will appear for that DataPoint.
- Now Rows property is dependent upon Angle property in AxisLabels.
下载 Visifire v2.2.7 beta 这里. | 
