DateTimeAxis Confusion

[DarkMortainius]

I'm trying to do a simple line chart of data over time, with a period of 2ms. I am getting the data to display on the chart just fine, but I can't get it to match up with the X-Axis at all, and I'm not sure why.

// GraphFile.Period = 2000 (i.e. 2 ms)
XAxis.Add(new DateTimeAxis(TimeSpan.FromMicroseconds(GraphFile.Period), time => time.ToString("HH:mm:ss:fff")));

My data is just a list of unsigned long, but this is all I'm seeing on my chart. I would expect the first point to be at 0, second at 2ms, third at 4ms, etc...

What am I not doing right?