[flexcoders] Resizing a popup to fit a List with dataProvider changes

[djepyon]

I have a popup with some buttons and a list in it. When you press a
button it assigns a new value to the dataProvider. Initially the popup
fits snug around the List but when the dp changes and the List grows
or shrinks the container that is the popup doesn't resize with it. Is
validateNow() the solution to this sort of thing? Perhaps I need to
listen for a resize event on the List and then force validation on its
container?