You can find it here: http://gtkdcoding.com/2019/06/14/0044-custom-dialog-iii.html
Blog Post #0044 - File Dialog X - Custom Dialogs (3 of 3)
Ron Tarrant via Digitalmars-d-learn Fri, 14 Jun 2019 02:31:12 -0700
Today sees the last of the mini-series on custom Dialog windows
wherein we combine everything from the first two articles
together into one final *Dialog*.