vs2010, 对按钮进行重绘， 包含3种按钮， 常规按钮、菜单按钮、图片按钮的简单重绘功能。望对初学控件重绘有一定帮助(In vs2010, the button is redrawn, with three buttons, the simple redrawing function of the normal button, menu button and picture button.It is helpful to redraw the primary control)