Tree/Window receiving focus/blur events

Are there any plans to implement
FieldEvents.FocusNotifier
interface in
com.vaadin.ui.Tree
?

Or even better, are there any plans to change
com.vaadin.ui.Window
so that it receives
FieldEvents.BlurEvent
's when focus is transferred to a component outside of its component tree?

e.g. I would like to be able to create a popup window which closes when the user clicks outside of it.