如何在工具栏添加下拉菜单(visual studio C++源代码编写)

[{"title":"（ 31 个子文件 159KB ） 如何在工具栏添加下拉菜单(visual studio C++源代码编写)","children":[{"title":"C++2010-01-29 如何在工具栏添加下拉菜单","children":[{"title":"Example","children":[{"title":"未命名1.JPG <span style='color:#111;'> 875B </span>","children":null,"spread":false},{"title":"resource.h <span style='color:#111;'> 91B </span>","children":null,"spread":false},{"title":"app.rc <span style='color:#111;'> 1.22KB </span>","children":null,"spread":false},{"title":"未命名11.JPG <span style='color:#111;'> 2.11KB </span>","children":null,"spread":false},{"title":"stdafx.h <span style='color:#111;'> 155B </span>","children":null,"spread":false},{"title":"AssemblyInfo.cpp <span style='color:#111;'> 1.14KB </span>","children":null,"spread":false},{"title":"未命名2.JPG <span style='color:#111;'> 1.82KB </span>","children":null,"spread":false},{"title":"未命名3.JPG <span style='color:#111;'> 2.83KB </span>","children":null,"spread":false},{"title":"stdafx.cpp <span style='color:#111;'> 138B </span>","children":null,"spread":false},{"title":"app.ico <span style='color:#111;'> 1.05KB </span>","children":null,"spread":false},{"title":"ReadMe.txt <span style='color:#111;'> 971B </span>","children":null,"spread":false},{"title":"Example.cpp <span style='color:#111;'> 390B </span>","children":null,"spread":false},{"title":"Example.vcproj <span style='color:#111;'> 5.64KB </span>","children":null,"spread":false},{"title":"Form1.resx <span style='color:#111;'> 20.44KB </span>","children":null,"spread":false},{"title":"Release","children":[{"title":"Example.obj <span style='color:#111;'> 28.28KB </span>","children":null,"spread":false},{"title":"AssemblyInfo.obj <span style='color:#111;'> 6.51KB </span>","children":null,"spread":false},{"title":"Example.exe.intermediate.manifest <span style='color:#111;'> 380B </span>","children":null,"spread":false},{"title":"vc80.pdb <span style='color:#111;'> 92.00KB </span>","children":null,"spread":false},{"title":"stdafx.obj <span style='color:#111;'> 15.91KB </span>","children":null,"spread":false},{"title":"BuildLog.htm <span style='color:#111;'> 7.57KB </span>","children":null,"spread":false},{"title":"Example.Form1.resources <span style='color:#111;'> 10.49KB </span>","children":null,"spread":false},{"title":"mt.dep <span style='color:#111;'> 67B </span>","children":null,"spread":false},{"title":"app.res <span style='color:#111;'> 1.18KB </span>","children":null,"spread":false}],"spread":false},{"title":"Example.vcproj.LUOBIN.luo01.user <span style='color:#111;'> 1.38KB </span>","children":null,"spread":false},{"title":"未命名.JPG <span style='color:#111;'> 32.84KB </span>","children":null,"spread":false},{"title":"Form1.h <span style='color:#111;'> 8.24KB </span>","children":null,"spread":false}],"spread":false},{"title":"release","children":[{"title":"Example.pdb <span style='color:#111;'> 187.00KB </span>","children":null,"spread":false},{"title":"Example.exe <span style='color:#111;'> 49.00KB </span>","children":null,"spread":false}],"spread":true},{"title":"Example.sln <span style='color:#111;'> 886B </span>","children":null,"spread":false},{"title":"readme.txt <span style='color:#111;'> 128B </span>","children":null,"spread":false},{"title":"Example.suo <span style='color:#111;'> 9.00KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]