Autoscale Y axis

[Grass_Pitch]

Hello,
  I would like to autoscale the y-axis in a X-Y plot with the minimum
set always to 0 and while the maximum autoscales. I tried to set
y-scale start and minimum (using the XY plot properties) but still the
y range minimum is set to the minimum value of the data. I would like
the y-axis scale to be set at 0 for the minimum and the max. of the
data for the maximum. Can anyone help with this. Thanks.