You can have the both worlds of a reactive tree and MVC. Each node in the tree can but doesn't have to have a controller that react to external messages or even

You can have the both worlds of a reactive tree and MVC. Each node in the tree can but doesn't have to have a controller that react to external messages or event messages from it's children. Bubbling is a useful property of the event system of this tree. This can be done quite nicely using normal JavaScript and the DOM. Bubble up, invoke down.