Hello chaily pardes,
Please put this line of code after calling InitializeComponent:
|this.radCarousel1.CarouselElement.Children.Visibility = Telerik.WinControls.ElementVisibility.Hidden;
Also, you can hide the border from Edit UI Elements (refer to the attached screenshot).
Please, keep in mind that the transparency may cause some performance issues. I would suggest you set ItemReflectionPercentage property to zero or decrease its value. Or you can avoid transparency by setting a Carousel background image that mixes well with the form background.
A very good example that demonstrates RadCarousel with a well-mixed background is located in the Demo Application (RadCarousel -> Music Library).
Don't hesitate to contact us if you have other question.
the Telerik team