FIX A modal popup that has Overlay=true does not create an overlay for the modal background
When the control is modal it should create a second iframe behind the modal background like it creates one behind the popup itself. This will allow the modal background to stay above heavy-weight objects in IE as well.
Posted on:21 Feb 2017 13:49
This will not be implemented. An overlay must be an iframe, and an opaque iframe. This will break the concept of a semi-transparent modal background.