mschart - MS Chart.NET - how to control Axis Interval in Auto mode? -

this has been asked before, unable find satisfying answer. using ms chart .net (3.5) control on asp.net page. i'd keep axisx , axisy in auto mode - when interval large , axis labels "0,5,10,15.." or "0,100,200,300.." it's fine. when difference between min , max values small - auto mode switches fractions e.g. "0, 0.5, 1, 1.5 .." etc.

my question is: how keep interval in auto mode, make minimum "tick" 1?

thanks!