Armin Winkler 
Has successfully completed the online course Introduction
Has successfully completed the online course Intermediate (200)
Has successfully completed the online course Advanced (300)
Has successfully completed the online course Basics (100)Hi David,
unfortunately setting a domain type for property validation dynamically during runtime of an application is not possible. The reason being, that based on the chosen domain type for property validation, a self-invoking function will be generated into the source code of the app and attached to the chosen event of the widget, see the following screenshot for an example:
This function declaration is therefore hardcoded and cannot be accessed or manipulated at a later point in time after the deployment. However, you can create a feature request in our Ideas portal (you’ll find the link here in your community profile overview by clicking on the button named ‘Ideas & Roadmap’ in the header section) and leave your requirements there so the desired functionality could be added to the platform in a future Simplifier release by us.
Thank you and kind regards,
Armin