创建新层，把后面的所有其他按钮的外形了。画一个软阴影。
Createnew layer and place it behind all other button shapes. Draw a soft shadow.
也就是说在场景环境中，渲染面板的阴影按钮和渲染按钮必须按下！
This means that the Shadow Button of the Render Panel in the Scene Context and Render Buttons must be on!
单击“绘图”工具栏上的“阴影”按钮，可为选定单元格或对象加上三维阴影。
As a shortcut for adding a shadow border to selected cells or objects, click the Drop shadow button on the Drawing toolbar.
阴影缓存大小-数字按钮，从512到1024，定义阴影缓存的尺寸。
ShadowBuffSize - Numeric Button, from 512 to 10240, defining the shadow buffer size.
阴影缓存大小-数字按钮，从512到1024，定义阴影缓存的尺寸。
ShadowBuffSize - Numeric Button, from 512 to 10240, defining the shadow buffer size.
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