dsoulMvin
if you do it on one column then yes it's easy, you instantiate your items with a width or height = 0, then you expand them using a tween or animation, and the items following will be pushed accordingly.
If you want the same behaviour than in the video where the sub items spawns on 2 or 3 columns, then it's possible but will require more custom code to find the best position to instantiate them on each separate column.
Does that makes sense?
