You can use the Add method to specify the group's caption, when the group is added to groups collection. Use the CaptionFormat property to allow built-in HTML tags in the group's caption. The control fires the ExpandGroup event when the user clicks the group's caption. The control fires the SelectGroup event when the user clicks the caption of the group. Use the Expanded property to expand a group. Use the DisplayExpandIcon property to show or hide the expand/collapse icons. Use the ExpandIcon property to specify the icons used for expanded/collapsed groups. Use the Bold, Italic, Underline or StrikeOut property to define the font for caption of the group.