给应用程序的主框架增加tab控制条，类似tab页面，对应着每个MDIchild窗口,可设置在顶部或底部显示, 可设置显示Tab 的最少child窗口数.-Give applications to increase the main fr a me section tab control, similar to tab page MDIchild corresponds to each window can be set at the top or bottom of display can sh