When RenderMode is set to Lightweight
the control yields completely different markup making maximum use of CSS 3 and semantic html. This means that we no longer use table element for the input part and have dropped the image gradients in favor of CSS gradients. As for the skins, the main goal of using the Lightweight render mode is that image gradients could be easily replaced by CSS gradients. Thus, the amount of data that the client browser should request is sensibly decreased. This enhancement favors especially the mobile experience.
Regarding the SaveScrollPosition that s not working when row is selected you can find attached a sample test page where the position is saved. Give it a try and see what is the difference in your case.
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