VC中mfc有个bug，滚动视中的滚动条拖动到32767位置时滑块就自动回到零位置，本方法可修复次bug。-Modify VC Scroll bar bug

关于VC++下的鼠标操作，包括对自绘图形拖动，模拟鼠标点击，鼠标绘制任意图形等-About mouse under VC++, including self-drawing shaped drag simulate mouse clicks, mouse to draw any graphics, etc.