Thanks a lot for the reply. It is really wonderful to solve the problem in pure BO creation. 🙂
However, I'd also like to use it with 'Add New' for adding a referred BO (child BO). In the default implementation of 'Add New', the form is initiated with Parent BO's value for reference attribute. But using 'ENTER NEW', don't know how to set the initial values for reference attributes using 'WITH'.
Is there any way to add a message stating the item was sucessfully added with 'Add New'?