本文中主要讲到如何在多文档中加入一个ControlBar,以及如何在ControlBar中加入一个树控方法。这也是软件系统中常用的一种界面，希望能对大家有所帮助。 -This article mainly talked about how to join a multi-document ControlBar, and how to add a tree in ControlBar control method. This is a common software interface syst