How can i implement an interface like BB Messenger?

How can i implement an interfa开发者_运维百科ce like BB Messenger showing a tree with a list of complex field items that are shown only if the tree item expands.??

Use a ListField for the contents of the collapsible area (you control how each row is painted), and use some other focusable field for the header. Add both to a VerticalFieldManager. When you click on the header once, remove the ListField from the Manager. When you click on it again, add it back.

I think you are talking about tree view. for that you can try this. Create a field to display a tree view