I would like to create a rectangular 'flat 3D' look for one of my control templates. In it's most simple version this means having a line at the bottom that is darker than that at the top, and maybe some variation between the left and right lines too.I would like to create a rectangular 'flat 3D'
阅读背景：
如何为WPF元素提供矩形平面3D边框？
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