代码说明： 平面的滚动栏，有箭头，按钮，轨迹等鼠标功能 TFatScrollBar is a flat scrollbar component. It doesn't have any 3D capabilities. Features: color, brush-style or pattern settings for each of these areas: arrow, arrow button, track, scroller, for each of these events: mouse out (cold), mouse in (hot), left-button press (down).

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