a dropdownlist control support write support onselectchange.....

ExternalControls\AssemblyInfo.cs
................\bin\Debug\ExternalControls.dll
................\...\.....\ExternalControls.pdb
................\...\x86\Debug\ExternalControls.dll
................\...\...\.....\ExternalControls.pdb
................\ExternalControls.csproj
................\ExternalControls.csproj.user
................\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
................\...\.....\ExternalControls.csproj.FileListAbsolute.txt
................\...\.....\ExternalControls.dll
................\...\.....\ExternalControls.pdb
................\...\.....\ExternalControls.projdata
................\...\x86\Debug\ExternalControls.csproj.FileListAbsolute.txt
................\...\...\.....\ExternalControls.dll
................\...\...\.....\ExternalControls.pdb
................\WritableDropDownList.cs
................\obj\x86\Debug\TempPE
................\bin\x86\Debug
................\obj\Debug\Refactor
................\...\.....\temp
................\...\.....\TempPE
................\...\x86\Debug
................\bin\Debug
................\...\Release
................\...\x86
................\obj\Debug
................\...\x86
................\bin
................\obj
ExternalControls

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