I have answered your support ticket. For convenience I am pasting my reply below:
I see that you have set the rotator's type to ButtonsOver - if you
change the value of that property to one of the other modes, the
scrolling buttons will not be rendered. If you want to keep the mode
but remove the buttons, you can remove them by using CSS - you just
need to find their classes (for example with Dev Toolbar) and set their
display to none.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.