Extended listview, so that group grouping can shrink, expand

ListViewGroupCollapse
.....................\ListViewGroupCollapse
.....................\ListViewGroupCollapse.sln
.....................\ListViewGroupCollapse.suo
.....................\.....................\bin
.....................\.....................\...\Debug
.....................\.....................\...\.....\ListViewGroupCollapse.exe
.....................\.....................\...\.....\ListViewGroupCollapse.pdb
.....................\.....................\...\.....\ListViewGroupCollapse.vshost.exe
.....................\.....................\...\.....\ListViewGroupCollapse.vshost.exe.manifest
.....................\.....................\Form1.cs
.....................\.....................\Form1.Designer.cs
.....................\.....................\Form1.resx
.....................\.....................\ListViewExtended.cs
.....................\.....................\ListViewGroupCollapse.csproj
.....................\.....................\obj
.....................\.....................\...\Debug
.....................\.....................\...\.....\ListViewGroupCollapse.csproj.FileListAbsolute.txt
.....................\.....................\...\.....\ListViewGroupCollapse.csproj.GenerateResource.Cache
.....................\.....................\...\.....\ListViewGroupCollapse.exe
.....................\.....................\...\.....\ListViewGroupCollapse.Form1.resources
.....................\.....................\...\.....\ListViewGroupCollapse.pdb
.....................\.....................\...\.....\ListViewGroupCollapse.Properties.Resources.resources
.....................\.....................\...\.....\TempPE
.....................\.....................\Program.cs
.....................\.....................\Properties
.....................\.....................\..........\AssemblyInfo.cs
.....................\.....................\..........\Resources.Designer.cs
.....................\.....................\..........\Resources.resx
.....................\.....................\..........\Settings.Designer.cs
.....................\.....................\..........\Settings.settings

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