Data Points at Top & Bottom pf Plot Area - need space

I am using C# in ASP.Net to create a dynamically loaded line graph chart.  The axis values and amount of series change depending on the data requested by the user.  My problem is that the maximum and minimum data points display on the very top and bottom of the plotting area.  I would like a little extra room so the data point is obvious. I have tried numerous setting changes (but apparently not the right one).  Can anyone recommend the correct setting for this?  Thanks.

Never mind - found it:

YAxis.AxisMode property = "Extended"