You can find it here: http://gtkdcoding.com/2019/06/04/0041-colorchooserdialog.html
Blog Post #0041 - File Dialog VII - The ColorChooser Dialog
Ron Tarrant via Digitalmars-d-learn Tue, 04 Jun 2019 04:50:52 -0700
For the first blog instalment this week, we look at the
ColorChooserDialog and discuss the differences between it and the
ColorChooserButton as well as how to by-pass white as a default
color.