A few months ago, I was asked to develop a combo box that contains a tree view inside it. Initially, I used a normal tree view control, but I soon realized that I was short of space on some of the win forms. Now, in another project, I needed to use a multi select combo box, so I transformed the old tree view combo into a generic combo so that in the future I can add any control (for example, grid view, tree view, list box or any user control) inside the combo. In this article, I will focus on Multi-select and tree view combo but in the attached file you can find some more examples of this generic approach. I hope this article will be helpful for you.

ExtensiveCombo
..............\ExtensiveCombo
..............\..............\bin
..............\..............\...\Debug
..............\..............\...\.....\ExtensiveCombo.exe
..............\..............\...\.....\ExtensiveCombo.pdb
..............\..............\...\.....\ExtensiveCombo.vshost.exe
..............\..............\EXTCombo.cs
..............\..............\EXTCombo.Designer.cs
..............\..............\ExtensiveCombo.csproj
..............\..............\frmEXTCombo.cs
..............\..............\frmEXTCombo.Designer.cs
..............\..............\frmEXTCombo.resx
..............\..............\GridView4Combo.cs
..............\..............\GridView4Combo.Designer.cs
..............\..............\IEXTCombo.cs
..............\..............\MultiSelect4Combo.cs
..............\..............\MultiSelect4Combo.Designer.cs
..............\..............\obj
..............\..............\...\Debug
..............\..............\...\.....\ExtensiveCombo.csproj.GenerateResource.Cache
..............\..............\...\.....\ExtensiveCombo.exe
..............\..............\...\.....\ExtensiveCombo.frmEXTCombo.resources
..............\..............\...\.....\ExtensiveCombo.pdb
..............\..............\...\.....\ExtensiveCombo.Properties.Resources.resources
..............\..............\...\.....\ExtensiveCombo.WeekDays4Combo.resources
..............\..............\...\.....\Refactor
..............\..............\...\.....\TempPE
..............\..............\...\.....\......\Properties.Resources.Designer.cs.dll
..............\..............\...\ExtensiveCombo.csproj.FileList.txt
..............\..............\Program.cs
..............\..............\Properties
..............\..............\..........\AssemblyInfo.cs
..............\..............\..........\Resources.Designer.cs
..............\..............\..........\Resources.resx
..............\..............\..........\Settings.Designer.cs
..............\..............\..........\Settings.settings
..............\..............\TreeView4Combo.cs
..............\..............\TreeView4Combo.Designer.cs
..............\..............\WeekDays4Combo.cs
..............\..............\WeekDays4Combo.Designer.cs
..............\..............\WeekDays4Combo.resx
..............\ExtensiveCombo.sln

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