获取或设置在控件边框内按下鼠标时按钮工作区的颜色。
Gets or sets the color of the client area of the button when the mouse pointer is within the bounds of the control.
参考下一节中的代码块，它会在鼠标按下时设置各帧。
Consult the next section for the code block that sets each frame when the mouse is down.
接口策略是当鼠标键按下时，在鼠标当前坐标打开“失真门户”。
The interface strategy is to have a "distortion portal" opened at the current mouse coordinates when the mouse button is down.
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