To Reproduce: this.AllowAero = false; this.radRibbonBar1.RibbonBarElement.RibbonCaption.MinimizeButton.Visibility = Telerik.WinControls.ElementVisibility.Collapsed; this.radRibbonBar1.RibbonBarElement.RibbonCaption.MaximizeButton.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;