The question of the day comes from David Smith on the dev mailing
list who wants to, if I understand it correctly, click a scene,
display a dialog, and then cause a widget to be created. If that's
not the problem he's trying to solve, then maybe this will help
some of the way there.
What we'll do is, let the user right-click in a scene, which
produces two menu items:
Upon choosing a menu item, a dialog will pop up, asking for a
description of the chosen item:
And then, when OK...
