Accessing and customizing elements can be performed either at design time, or at run time. Before proceeding with this topic, it is recommended to get familiar with the visual structure of the RadRibbonForm.
You can access and modify the style for different elements in RadRibbonForm by using the Element hierarchy editor.
You can customize the nested elements at run time as well:
this.AllowAero = false;
this.RibbonBar.RibbonBarElement.CaptionFill.BackColor = Color.Lime;
Me.AllowAero = False
Me.RibbonBar.RibbonBarElement.CaptionFill.BackColor = Color.Lime