Panel Change Listener???

Hi Community,
is there an option to add an Change listener to an Vaadin panel. I want to check if something has change on the panel?

My Situation:
I have a View with a GridLayout on it. The View consist of various differents layouts. One Layout should add an Table (Runtime). My Problem, how can i add this table to the layout.

Wouldn’t the addComponent method be enough for this situation?