Because of the specific design they are after, not all themes may share the same set of settings, therefore the solution for you may depend on which theme you are using. However, the most common setting to be applied in this situation is the Visibility property set to Visible:
.radMenuItem1.FillPrimitive.BackColor = Color.Red;
.radMenuItem1.FillPrimitive.Visibility = Telerik.WinControls.ElementVisibility.Visible;
I hope this helps. If you still need assistance, please let me know which theme you are using, so that I can provide you with adequate assistance.
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