Alley Oop to yourself: Hold LT + Y on a fast break 
Cockback: Hold LT + X 
One Handed: Hold LT and tap X 
One Handed Windmill: Hold LT + A 
Lay Up: Hold LT + B 
Various dunks: Hold LT and tap Y 
Leaning Tomahawk: Hold LT and tap A 
Two Handed Tomahawk: Hold LT and tap B 
Two Handed Windmill: Hold LT + Y