wp7 ListBox/Advanced list like Native Mail client

I'm wondering how come the number of controls is limited to http://i.imgur.com/cRwie.png

I can not see how Mail's list is made. Can anyone shed some light on this? 开发者_C百科Specifically, I'm wondering how I can have a list of items, and when clicked, show options beneath it (as with Mail's grouping of conversations).

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Have a look at the ExpanderView in the newest version of the Toolkit.