>Hi Experts,
>
>Are Application Objects typically based on the Custom class?
>
>If so, then, being based on a non-visual class, can it show or instantiate a UI class - in my case, a Form object?

The UI objects are not app's members. The forms are standalone objects, basically members of _Screen.forms collection, but that happens automagically, behind the scenes. You don't do oApp.addobject("oform1", "myForm"), you do loFrm=createobject("myForm").

You can actually do it anywhere, it's just that you can't have a visual object as a _member_ of a non-visual one, i.e. a visual* object can't have a .parent that isn't a visual object.

*mind you, visual objects are those that have a .refresh, .fontname and other GUI-related properties. It doesn't matter whether they are defined in a .prg or in a .vcx at all.