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In a SashForm, there is no way to give the Sash a 3D look without putting a border on the Controls that the Sash separates. The Sash is just a flat gray line, which is not what the user expects a resizeable sash to look like. The look of the Sash should be independent of whether the Controls in the SashForm have borders.
No plan to change the Sash appearance. We reserve the right to have this look different on platforms which support (useful) native sash controls.