Specifies the height in pixels of an item in an owner-draw list box.
property ItemHeight: integer;
Use ItemHeight to control the height of an item in a list box when the ListStyle property is lbOwnerDrawFixed. The ItemHeight property can also affect the height of the list box itself. When the IntegralHeight property is True, the height of the list box is always an increment of the ItemHeight value.
If the ListStyle property is lbStandard or lbOwnerDrawVariable, the value of ItemHeight is ignored.