https://www.codeproject.com/Articles/14823/ColorEditorEx [ColorEditorEx - An extension to the ColorEditor to support translucent colors]
https://msdn.microsoft.com/magazine/msdn-magazine-issues [MSDN Magazine July 2003]-[Features]-[GDI+: A Primer on Building a Color Picker User Control with GDI+ in Visual Basic .NET or C#]