Please, find attached two zipped projects with two different solutions for RadSlider with rounded ends.
First solution: SliderRoundedFlexibleWidth - I have changed the image sprite in a way to show rounded ends for the SlideTrack. In that case you could specify any width for the RadSlider, as the rounded ends are part of the sprite that inserts the arrows and it does not have any problem with the width of the SlideTrack. The problem of that solution is that the rounded ends are not part of the SlideTrack. And even if the slider covers the round end visually you should consider that it is not part of the SlideTrack.
Files in SliderRoundedFlexibleWidth: Default.aspx, HandlesRounded.gif
Second solution: SliderRoundedFixedWidth - This is a solution with a fixed width. The advantage is that in that case the rounded ends are part of the SlideTrack. The limitation is that you should have fixed width for the SlideTrack.
Files in SliderRoundedFixedWidth: Default.aspx, RoundSelected.gif, RoundSlide.gif
All the best,
the Telerik team
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