ToolBar上添加滚动条和下拉框

[{"title":"（ 50 个子文件 4.6MB ） ToolBar上添加滚动条和下拉框","children":[{"title":"ToolBar上添加滚动条和下拉框","children":[{"title":"Test","children":[{"title":"Test2.dsw <span style='color:#111;'> 535B </span>","children":null,"spread":false},{"title":"StdAfx.cpp <span style='color:#111;'> 207B </span>","children":null,"spread":false},{"title":"Test2View.cpp <span style='color:#111;'> 2.91KB </span>","children":null,"spread":false},{"title":"resource.h <span style='color:#111;'> 686B </span>","children":null,"spread":false},{"title":"Test2.suo <span style='color:#111;'> 10.50KB </span>","children":null,"spread":false},{"title":"Test2.clw <span style='color:#111;'> 2.44KB </span>","children":null,"spread":false},{"title":"Test2.aps <span style='color:#111;'> 43.44KB </span>","children":null,"spread":false},{"title":"Test2.h <span style='color:#111;'> 1.31KB </span>","children":null,"spread":false},{"title":"MainFrm.h <span style='color:#111;'> 1.68KB 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328.25KB </span>","children":null,"spread":false},{"title":"vc80.idb <span style='color:#111;'> 707.00KB </span>","children":null,"spread":false},{"title":"Test2.obj <span style='color:#111;'> 35.88KB </span>","children":null,"spread":false},{"title":"MainToolBar.obj <span style='color:#111;'> 21.48KB </span>","children":null,"spread":false},{"title":"Test2View.obj <span style='color:#111;'> 33.36KB </span>","children":null,"spread":false},{"title":"Test2.exe <span style='color:#111;'> 100.00KB </span>","children":null,"spread":false}],"spread":false},{"title":"ReadMe.txt <span style='color:#111;'> 4.19KB </span>","children":null,"spread":false},{"title":"StdAfx.h <span style='color:#111;'> 1.03KB </span>","children":null,"spread":false},{"title":"MainToolBar.cpp <span style='color:#111;'> 694B </span>","children":null,"spread":false},{"title":"MainFrm.cpp <span style='color:#111;'> 4.42KB </span>","children":null,"spread":false},{"title":"Test2.cpp <span style='color:#111;'> 4.33KB 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