说明：  这个例子让你的程序可以在运行期间对控件进行选取、移动、动态更改所选对象尺寸等可视操作，和Delphi中的控件编辑很相似！ 原是从国处论坛上抓过来的代码，只是原来的代码有BUG。
(the example for your program can run in the period to control for selection, moving, Dynamic changes in the size, and other selected targets visualization operations and Delphi, the controls very similar to edit! Was originally from the State Department forum grasp over the code, the original code BUG.)