https://msdn.microsoft.com/zh-cn/library/system.windows.controls.control(v=vs.110).aspx
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.canvas(v=vs.110).aspx
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.control(v=vs.110).aspx
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.canvas(v=vs.110).aspx