在VS 2010 环境下，通过自绘窗口，做出类似百叶窗的展开和收缩的效果，并实现清理痕迹的功能（当然清理功能不是很强，需要改进）-In VS 2010 environment, through self-painted window, made ​ ​ a similar expansion and contraction effect blinds, and to achieve clean up traces of the functions (of course cle