说明：  在用Gtk+进行Linux应用开发时,往往会遇到现有的构件不能满足需要的情况。本文详细论述了创建Gtk+新构件的一般流程和实现方法。
(When developing Linux applications with Gtk+,it is often encountered that the existing widgets can not meet the need.This paper discusses the flow and the implementation method of creating new Gtk+ widgets.)