Gets an object representing the brush used to fill the group client area.
A System.Drawing.Brush descendant representing the brush used to fill the group's client area.
If an image is used to fill the group's background, a special brush object is created to perform the task. This object is returned by the TextureBackgroundBrush property. If no image is specified for group background, this property returns null (Nothing in Visual Basic).
Group background image is specified by the NavBarControl.GroupBackgroundImage property. You can also use the NavBarGroup.BackgroundImage property to specify different background images for each group.