Add a new property for objects like "Buttons" or "Button Bars" to behave as a "Background Objects".
When an object is set with this property, it can be added in multiple layouts at the same time to share the same behavior and position in the layout. This can accelerate the development process and add the ability to create "widget" type objects with the combination of multiple elements in a single one.
For example: in an iOS App, to create a Tabbed App using a "Button Bar" to handle the navigation cross multiple layouts. The object can be placed in the Bottom Navigation layout part and share the same behavior in multiple layouts.