Oh I found it. Here was a thread on LAVA where people started implementing other features of the system dialog box, like hiding and showing content, custom buttons, radio buttons, custom icons, and more. Here was the last post I made with these examples but code was improved later.
https://lavag.org/topic/19039-cr-taskdialogindirect-win-api-comctl32dll/?do=findComment&comment=1148...