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Design time
Updated over 6 months ago
You can access and modify the style for different elements in RadCommandBar by selecting the element and customizing its look by the Properties section in Visual Studio
Figure 1: Customizing CommandBarStripElement's border at design time.

Programmatically
You can customize the elements at run time as well:
Figure 2: Customize elements

Customize elements at run time
C#
this.radCommandBar1.Rows[0].BackColor = Color.Lime;
this.radCommandBar1.Rows[0].DrawFill = true;
this.radCommandBar1.Rows[0].GradientStyle = Telerik.WinControls.GradientStyles.Solid;
this.radCommandBar1.Rows[0].Strips[0].BackColor = Color.Yellow;
this.radCommandBar1.Rows[0].Strips[0].BorderColor = Color.Red;