使用现成的已经编写好的控件当然是很方便的事情，但是有的时候随着C#编成应用的不断深入，已有的控件已经不能满足实际需求，所以不得不自己在现有控件的基础上扩展功能，本程序通过一个扩展button控件功能而形成自己开发的控件，可以给CSharp开发者一个简单明了的参考。简单不失一般性-use off-the-shelf component has prepared a good course is a convenient thing, Some, however, when C# organization with the in-depth application, the controls have already unable to meet the actual demand. So I have to own the existing controls on the basis of the functional expansion, The procedures through an expansion button controls its own function and the development of the controls, CSharp can give developers a simple reference. Simple without loss of generality