Draws a scroll button on a scroll bar control.
在卷轴控制项上绘制卷轴按钮。
Draws the specified scroll button on a scroll bar control in the specified state, on the specified graphics surface, and within the specified bounds.
在指定的图形表层和指定的范围内,于卷轴控制项上绘制指定状态的指定卷轴按钮。
Mice with a scroll wheel as a middle mouse button are fairly popular, so support is being added.
用一个滚动轮作为鼠标中键的鼠标非常流行,所以增加了对它的支持。
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