I don't know how to attach it, but these are the events I've got so far:
1. Mouse on left button clicked + player is overlapping Box > box set position to player (image point 1) + pin to player
2. Mouse on right button clicked + box pin is pinned > pin unpin + apply force 5 towards position (Player.X+5,Player.Y+5, imagepoint 0)
The Player has Platform behaviour, the box Pin behaviour and Physics behaviour.
Does that tell you anything usefull ?
Cheers,
J.