I have seen an example of a drag method, which used an offset object that constantly calculated the difference between the position of the mouse and the position of the initial click, I think. But this is way easier.
1) The mousemove event listener has to be added to the mousedown event in order to work.
2) Position the object using the stageX and Y properties of the mousemove event.
3) Be sure to update the stage!
A mouse up event occurs when you release the mouse, so if you need something to occur then, add a mouseup event listener to the mousedown event.
EDIT: I came across this method somewhere else later - oh well, I guess I'm not a programming genius...
