Form editor suggestion, a way to add forms to forms

[Bruce Steers <bsteers4@xxxxxxxxx>]

It would be handy to have a way to add forms to forms in the IDE

Ie.
I create form_A and form_B
currently if i want to add form_B to form_A i have to do it by code
form_B = New form_B(panelForFormB)

But how about being able to drag-n-drop from the project tree?
So if i drag form_B from the project tree to form_A in the designer it adds
it?

good idea? easy to implement?
or terrible idea?
or already possible i just don't know how?

Respects
BruceS