Let’s be blunt and harsh about this; it is garbage
I’ve used Microsoft Access dev tools 15+ years ago that were far, far better than this.
Anything beyond a simple, bound textbox leads to worlds of pain.
Intellisense?? Not really
Code debugging - forget it (yes, I know you can use VS, but not everyone has access to this)
documentation?; ha ha ha
The underlying Infragistics control toolset one which the UI is based is a very old release and buggy. Plus you soon get the sense that Epicor hasn’t done a particulatly good job on the object inheritance. If you try and be clever and root through the Infragistics documentation don;t expect properties and methods to work always.
Epicor have effectively abandoned the C# client and and moved to the one based on JS objects run through a browser using a toolset from their ool friends at Progress. I suspect it is going to take several years to convert all the forms and give a decent development experience