Share 'Trees for Support'

If my lie is right in front of a tree and directly in line with the basket, can I mark my lie, grab the tree (that is behind me) for support, lean out (keeping my foot behind my mini), and make my throw? I know this would not work if the tree was in front of me and I was leaning on it, but someone asked me recently (after I had just done it with the tree behind me), and I said that since the tree…