Set or get the background color NavBarControl of DevExpress?

Set or get the background color NavBar Control of DevExpress ? I've set (or get) the background color NavBar Control but it isn't ? you see code below.

set background color NavBar Control:

Code:
 
navBarControl1.Appearance.GroupBackground.BackColor  = Color.White;
 navBarControl1.BackColor = Color.White;

or get background color NavBar Control:

Code:
 
System.Drawing.Color c1 =  navBarControl1.Appearance.GroupBackground.BackColor;
 System.Drawing.Color c2 = navBarControl1.BackColor;
 webBrowser1.Document.BackColor = c1;
 webBrowser2.Document.BackColor = c2;

do you know set or get the background color NavBar ?