Reduce the height of a telerik graph chart - objective-c

I am creating a graph chart using telerik TChart. Using storyboard I set the position of a graphview.
For iPhone,it's height is correct for all values of chart but for Ipad if I give maximum value it will touch the above labels. so I have to reduce the height of that view of chart programmatically.
Is there any way to reduce the height of graph.If I want to set frame size height of graph using
_graphView.translatesAutoresizingMaskIntoConstraints
it will generate exception. so is there any other way to set height.

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