WPF to achieve the drop-down box

DownBox2
........\DownBox2
........\........\bin
........\........\...\Debug
........\........\...\.....\DownBox2.dll
........\........\...\.....\DownBox2.pdb
........\........\...\Release
........\........\...\.......\DownBox2.dll
........\........\...\.......\DownBox2.pdb
........\........\Dictionary1.xaml
........\........\DownBox2.csproj
........\........\DownBox2.csproj.user
........\........\obj
........\........\...\Debug
........\........\...\.....\DesignTimeResolveAssemblyReferences.cache
........\........\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
........\........\...\.....\Dictionary1.baml
........\........\...\.....\DownBox2.csproj.FileListAbsolute.txt
........\........\...\.....\DownBox2.dll
........\........\...\.....\DownBox2.g.resources
........\........\...\.....\DownBox2.pdb
........\........\...\.....\DownBox2.Properties.Resources.resources
........\........\...\.....\DownBox2_MarkupCompile.cache
........\........\...\.....\DownBox2_MarkupCompile.i.cache
........\........\...\.....\GenerateResource.read.1.tlog
........\........\...\.....\GenerateResource.write.1.tlog
........\........\...\.....\TempPE
........\........\...\.....\......\Properties.Resources.Designer.cs.dll
........\........\...\.....\UserControl1.baml
........\........\...\.....\UserControl1.g.cs
........\........\...\.....\UserControl1.g.i.cs
........\........\...\Release
........\........\...\.......\DesignTimeResolveAssemblyReferences.cache
........\........\...\.......\DesignTimeResolveAssemblyReferencesInput.cache
........\........\...\.......\Dictionary1.baml
........\........\...\.......\DownBox2.csproj.FileListAbsolute.txt
........\........\...\.......\DownBox2.dll
........\........\...\.......\DownBox2.g.resources
........\........\...\.......\DownBox2.pdb
........\........\...\.......\DownBox2.Properties.Resources.resources
........\........\...\.......\DownBox2_MarkupCompile.cache
........\........\...\.......\DownBox2_MarkupCompile.i.cache
........\........\...\.......\TempPE
........\........\...\.......\......\Properties.Resources.Designer.cs.dll
........\........\...\.......\UserControl1.baml
........\........\...\.......\UserControl1.g.cs
........\........\Properties
........\........\..........\AssemblyInfo.cs
........\........\..........\Resources.Designer.cs
........\........\..........\Resources.resx
........\........\..........\Settings.Designer.cs
........\........\..........\Settings.settings
........\........\UserControl1.xaml
........\........\UserControl1.xaml.cs
........\DownBox2.sln
........\DownBox2.suo

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