Thank you for writing.
Unfortunately, you cannot remove the RadTabStripElement
from the RadRibbonBar
You should hide the Element that contains the Max,Min and Close buttons using the following code:
.radRibbonBar1.RibbonBarElement.Children.Children.Children.Visibility = ElementVisibility.Collapsed;
If you have additional questions, do not hesitate to contact me.
the Telerik team