public XSSFValueAxis CreateValueAxis(AxisPosition pos)
{
long id = axis.Count + 1;
XSSFValueAxis valueAxis = new XSSFValueAxis(this, id, pos);
if (axis.Count == 1)
{
ChartAxis ax = axis[0];
ax.CrossAxis(valueAxis);
valueAxis.crossAxis(ax);
}
axis.Add(valueAxis);
return(valueAxis);
}