Hello Anatoly Chekh,
You can try setting AutoRange=false and setting MinYValue=0. This will pin the minimum end of the scale at zero, while leaving the max to be auto calculated.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items