How to change CheckedListBox item vertical space

The default implementation of ItemHeight property of CheckedListBox is,

public override int ItemHeight { 
        get {
            // this should take FontHeight + buffer into Consideration.
            return Font.Height + 2;
        } 
        set {
        } 
    } 

you can cleanly override this property in a new class.

public sealed class  MyListBox:CheckedListBox
    {
        public MyListBox()
        {
            ItemHeight = 30;
        }
        public override int ItemHeight { get; set; }
    }

this should allow you to set your own ItemHeight.