[FMX] HELP PLEASE! Looping Drag n Drop, Snap To

I’ve been assigned the task of creating a virtual sign maker. Theres 3 basic concepts, there are letters and other characters, a grid, and a trash can. The letters are draggable and i can get that to work, but i cant make the letters snap to the grid. Also i want to loop the letters so when i drag one another appears, and if not i can drag back a letter into place and it’ll snap. The other problem im having is finding a way to delete letters not wanted on the grid. I need help asap because im braindead in the world of actionscript and i’ve beeen trying for days looking at tutorials. If you can help me out with some coding that would be greatly appreciated.

I’ve attached a FLA.