Group Header
A group header is displayed at the top of the group and is used to show the group caption, group image, and group header sign. Note that Side Bar Views do not support group images and header signs.
The following image displays two groups with headers within the ExplorerBarView:
A NavBar group allows you to display either a small or large image within its header. Use the group’s LargeImageIndex and SmallImageIndex properties to associate images with a particular group. The NavBar control will use one of them based on the UseSmallImages property value.
Clicking a group header in Explorer Bar Views expands or collapses the corresponding group. In Side Bar Views, this results in making the corresponding group active (currently visible) while hiding the previously active one.