File list (Check if you may need any files):
CheckComboBoxTest
.................\CheckComboBoxTest
.................\.................\CCBoxItem.cs
.................\.................\CheckComboBoxTest.csproj
.................\.................\CheckedComboBox.cs
.................\.................\Form1.cs
.................\.................\Form1.Designer.cs
.................\.................\Form1.resx
.................\.................\Program.cs
.................\.................\Properties
.................\.................\..........\AssemblyInfo.cs
.................\.................\..........\Resources.Designer.cs
.................\.................\..........\Resources.resx
.................\.................\..........\Settings.Designer.cs
.................\.................\..........\Settings.settings
.................\CheckComboBoxTest.sln