By default, the height of the item is based on the height of the control's Font, so the height for all items are automatically updated once the user changes the control's font. The item's height is automatically computed if the SingleLine property is False. The Def(exCellSingleLine) / SingleLine property specifies whether the cell's caption is displayed by single or multiple lines. The ItemPadding property increases / decreases the vertical padding for items, including the control's header bar.