Group panels display headers of columns involved in data grouping. They also serve as drag-and-drop targets allowing end-users to drag column headers onto it. Right-clicking the group panel invokes the Group Panel Context Menu, which provides grouping related options.
The table below lists the main properties affecting element appearance.
Appearance
GridViewAppearances.GroupPanel
An element's background colors cannot be changed when a View is painted using the Office2003 paint theme, or any skinning paint style (see the BaseView.PaintStyleName property).
Custom Draw Event
GridView.CustomDrawGroupPanel
Text
GridView.GroupPanelText
Visibility
GridOptionsView.ShowGroupPanel
Column Arrangement
GridOptionsView.ShowGroupPanelColumnsAsSingleRow
GridOptionsCustomization.AllowMergedGrouping