编写实现一个模拟手机的图形用户界面，包括一个显示区和一个键盘区，显示区用来显示数字和信息，键盘区包括10个数字键（0～9）和“发送”、“清零”、“关机”三个命令键。考虑使用什么样的图形界用户界面布局策略。

为所编写的界面增加事件响应功能：当用户按数字键时，相应的数字回显在显示区上；当用户按“清零”键时，显示区的数字清空；当用户按“发送”键时，显示区中出现当前的号码和“拨号中......”的信息；当用户按关机键时结束程序。

-Writing implement a simulation of the mobile phone graphical user interface, including a display and a keyboard area, display used to indicate that a digital and information, the keyboard area including the 10 key figures (0 to 9) and "send" and "reset", "shut down" three command button. Consider using what graphics world user interface layout strategy.

For written interface increase incident response function: when the user press numeric keys, the corresponding digital back to show in display　When the user "reset" button, the figures show empty　When users click "send" button, display the current number and appeared in "dial up......" The information　When the user shutdown ended when key program.