Use the Caption property to change the item's caption. Use the UserData property to associate an extra data to the item. Use the CaptionFormat property to allow built-in HTML tags in the cell's caption. Use the Bold, Italic, Underline or StrikeOut property to define the font for caption of the item. The control fires the SelectItem event when the user clicks the item. You can specify the item's caption when using the AddItem method. Use the ItemHeight property to specify the height of the items in the group. Use the <img> HTML tag to insert icons inside the item's caption, if the CaptionFormat property is exHTML.