Some one helped me at the support team, here is there answer:

The pagerange is calculated when the control layouts (usually before repaint) – that’s why it’s initially zero – you can force control layout recalculation using:

nChartControl1.Document.Calculate();
nChartControl1.Document.RecalcLayout(nChartControl1.View.Context);

Hi,

I try to get the min and the max value of my Y axis because I need to set the custom major ticks to be the "same". The lines should be on each other.

I used this method before: m_Chart.Axis(axisList[i].AxisId).PageRange.Begin/.End but it does not seems to be working, it gives be back just 0s. any other way to retrieve those data?

This is how I set the axis range: m_Chart.Axis(axis.AxisId).View = new NRangeAxisView(new NRange1DD(X,Y));

Daniel