Histogram in Bar

namespace NevronProve1
{
     public class NNevronProve1UC
     {
public double [] XValues;
public double [] X2Values;
public double [] Values;
public double [] Y2Values;
public double [] ZValues;
public double [] Z2Values;

chart.Enable3D = true;
nThinChartControl1.ImageExporter.SaveToFile (dir + fileName, new nSize (this.XDimPixel, this.YDimPixel), NResolution.ScreenResolution, new NJpegImageFormat ());
}
}
how to read the position (in pixels) x, y, z of each single bar, to pass to XYZValues methods?
Thank you very much.

Ivano Rigato