Nested Widgets, Renderables, and other concept errors…

[formosa]

1. The term "Renderable" comes up a lot, but I can not find a meaningful definition beyond the vague, "something that can be rendered to the console". Is there a listing of object types that are considered "Renderable" because it appears to me that the only Renderables are Widgets..
2. Nest Widgets.. How can I place a Panel border around 2 button widgets and not lose functionality? I can't crack this. I'd love an example of two buttons that respond to mouse events, grouped inside of a framing Panel, forming a parent widget. Mouse over the parent object changes the panel framing color and continuing on to mousing over a contained button causes it to highlight. None of the examples I've seen leave any breadcrumbs to a solution. And, I'm not savvy enough to piece this together on my own..
3. What is Bubble?
4. Can Views contain Views? If so, how?
5. What's the relationship between a Message and an Event?
6. Is it possible to forward messages/events captured in one object to any other object of my choosing? Down the stack to a child element? (Related to question 2)
   Any info that could even slightly improve my understanding on these or related concepts would be greatly appreciated.

[geoff-va]

This may help with the first question:

• RenderableType
• ConsoleRenderable
• RichCast

From what I gather, it's anything that Rich can Render, eg via __rich__ or __rich_console__ or basic text strings.