I have a NBarSeries chart with MultiBarMode = MultiBarMode.Stacked;
When my value is less than 100% (say -131%), the DataLabelStyle only shows -100%. 
Is there a way to specify my own custom formatting for DataLabelStyle?

Code snippet:
NBarSeries oBar = chart.Series.Add(SeriesType.Bar) as NBarSeries;      
oBar.InflateMargins = true;
oBar.Name = name;
oBar.MultiBarMode = MultiBarMode.Stacked;
oBar.WidthPercent = 30;
oBar.DataLabelStyle.VertAlign = Nevron.VertAlign.Center;
oBar.DataLabelStyle.TextStyle.BackplaneStyle.Visible = false;
oBar.DataLabelStyle.TextStyle.FontStyle = new NFontStyle("Verdana", 7.0f, FontStyle.Bold);
oBar.DataLabelStyle.Format = "<percent>";
oBar.DataLabelStyle.ArrowLength = new NLength(0);
oBar.DataLabelStyle.Visible = true;
oBar.Values.Add(.IsNull() ? 0.0 : value.Value);

Hi Alex,

The data label in case is configured to displays percents of the stack total, not  the data point value. In this case since it is the only negative stack it displays 100% - you can easily assign custom data label style and/or formatting to either individual bars or entire series – for example:

bar.DataLabelStyle.Format = "<value>";

will display the data point value instead of total percent. Hope this helps – let us know if you meet any problems or have any questions.

Best Regards,
Nevron Support Team