Recently, the need to achieve a drop-down tree structure of the control box, but found it online, did not find the right used, so http://www.cnblogs.com/xiongeee/archive/2009/02/18/662468.html and MSDN basis, with some slight modifications to achieve the pull-down tree structure, to share with you once again to thank for a better tomorrow

ComboBoxTreeDemo
................\ComboBoxTree
................\............\bin
................\............\...\Debug
................\............\...\.....\ComboBoxTree.dll
................\............\...\.....\ComboBoxTree.pdb
................\............\ComboBoxTree.cs
................\............\ComboBoxTree.csproj
................\............\ComboBoxTree.Designer.cs
................\............\obj
................\............\...\Debug
................\............\...\.....\ComboBoxTree.csproj.FileListAbsolute.txt
................\............\...\.....\ComboBoxTree.dll
................\............\...\.....\ComboBoxTree.pdb
................\............\...\.....\Refactor
................\............\...\.....\TempPE
................\............\Properties
................\............\..........\AssemblyInfo.cs
................\ComboBoxTreeDemo
................\................\bin
................\................\...\Debug
................\................\...\.....\ComboBoxTree.dll
................\................\...\.....\ComboBoxTree.pdb
................\................\...\.....\ComboBoxTreeDemo.exe
................\................\...\.....\ComboBoxTreeDemo.pdb
................\................\...\.....\ComboBoxTreeDemo.vshost.exe
................\................\ComboBoxTreeDemo.csproj
................\................\MainForm.cs
................\................\MainForm.Designer.cs
................\................\MainForm.resx
................\................\obj
................\................\...\Debug
................\................\...\.....\ComboBoxTreeDemo.csproj.FileListAbsolute.txt
................\................\...\.....\ComboBoxTreeDemo.csproj.GenerateResource.Cache
................\................\...\.....\ComboBoxTreeDemo.exe
................\................\...\.....\ComboBoxTreeDemo.MainForm.resources
................\................\...\.....\ComboBoxTreeDemo.pdb
................\................\...\.....\ComboBoxTreeDemo.Properties.Resources.resources
................\................\...\.....\Refactor
................\................\...\.....\ResolveAssemblyReference.cache
................\................\...\.....\TempPE
................\................\Program.cs
................\................\Properties
................\................\..........\AssemblyInfo.cs
................\................\..........\Resources.Designer.cs
................\................\..........\Resources.resx
................\................\..........\Settings.Designer.cs
................\................\..........\Settings.settings
................\ComboBoxTreeDemo.sln

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