Combobox similar prior to the drop-down box in C# panel controls, no drop-down drop-down after a Panel control, you can freely define the hosted child control

DropDownPanel\Demo\bin\Debug\Demo.exe
.............\....\...\.....\Demo.pdb
.............\....\...\.....\Demo.vshost.exe
.............\....\...\.....\Demo.vshost.exe.manifest
.............\....\...\.....\DropDownPanel.dll
.............\....\...\.....\DropDownPanel.pdb
.............\....\Demo.csproj
.............\....\DerivedTreeCombo.cs
.............\....\DropDownNode.cs
.............\....\DropDownTree.cs
.............\....\MainForm.cs
.............\....\MainForm.Designer.cs
.............\....\MainForm.resx
.............\....\obj\Debug\Demo.csproj.FileListAbsolute.txt
.............\....\...\.....\Demo.csproj.GenerateResource.Cache
.............\....\...\.....\Demo.exe
.............\....\...\.....\Demo.MainForm.resources
.............\....\...\.....\Demo.pdb
.............\....\...\.....\Demo.Properties.Resources.resources
.............\....\...\.....\ResolveAssemblyReference.cache
.............\....\...\.....\TempPE\Properties.Resources.Designer.cs.dll
.............\....\Program.cs
.............\....\...perties\AssemblyInfo.cs
.............\....\..........\Resources.Designer.cs
.............\....\..........\Resources.resx
.............\....\..........\Settings.Designer.cs
.............\....\..........\Settings.settings
.............\Demo.sln
.............\Demo.suo
.............\.ropDownPanel\bin\Debug\DropDownPanel.dll
.............\.............\...\.....\DropDownPanel.pdb
.............\.............\Controls\DropDownPanel.cs
.............\.............\........\DropDownPanel.Designer.cs
.............\.............\DropDownPanel.csproj
.............\.............\DropDownPanel.resx
.............\.............\Events\Events.cs
.............\.............\Forms\DropDownForm.cs
.............\.............\.....\DropDownForm.designer.cs
.............\.............\.....\DropDownForm.resx
.............\.............\Helper\DropDownMessageFilter.cs
.............\.............\......\DropDownWindowHelper.cs
.............\.............\Interfaces\IDropDownAware.cs
.............\.............\..........\ILookupItem.cs
.............\.............\obj\Debug\AT.STO.UI.Win.DropDownForm.resources
.............\.............\...\.....\DropDownPanel.csproj.FileListAbsolute.txt
.............\.............\...\.....\DropDownPanel.csproj.GenerateResource.Cache
.............\.............\...\.....\DropDownPanel.dll
.............\.............\...\.....\DropDownPanel.pdb
.............\.............\Properties\AssemblyInfo.cs
.............\.............\Unmanaged\UIApiCalls.cs
.............\UpgradeLog.XML
.............\_UpgradeReport_Files\UpgradeReport.css
.............\....................\UpgradeReport.xslt
.............\....................\UpgradeReport_Minus.gif
.............\....................\UpgradeReport_Plus.gif
.............\Demo\obj\Debug\TempPE
.............\.ropDownPanel\obj\Debug\TempPE
.............\.emo\bin\Debug
.............\....\obj\Debug
.............\.ropDownPanel\bin\Debug
.............\.............\obj\Debug
.............\.emo\bin
.............\....\obj
.............\....\Properties
.............\.ropDownPanel\bin
.............\.............\Controls
.............\.............\Events
.............\.............\Forms
.............\.............\Helper
.............\.............\Interfaces
.............\.............\obj
.............\.............\Properties
.............\.............\Unmanaged
.............\Demo
.............\DropDownPanel
.............\_UpgradeReport_Files
DropDownPanel

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