自定义按钮，是button的自定义组件，给组件开发得人一些参考，有圆形，方形，菱形等得选择与响应-Custom button is a custom button components, to get people to develop a number of components of reference, there are round, square, diamond, such as a choice and to respond to

不规则窗体，有椭圆，正方形，菱形等。是大家学习Cwnd类的好例子-Irregular form, oval, square, diamond and so on. Is a good example of learning Cwnd class