Mission Control to App Exposé In Snow Leopard you could switch to App Exposé from global Exposé by clicking an icon in the Dock. Doing the same in Lion merely exits you from Mission Control and focuses on that app.

Is there a way to go to a given App Exposé from Mission Control?
Swipe up with 3 fingers = show mission control.
When mission control is shown, move your mouse to the app window, and
Swipe up with 2 fingers


This will show the app's windows.