Update Callbacks.md
Update Callbacks.md

added solution that works, even though I still don't understand callbacks!
daftano/interactive-tutorials,revzim/interactive-tutorials,daftano/interactive-tutorials,like9729/interactive-tutorials,daftano/interactive-tutorials,ronreiter/interactive-tutorials,ronreiter/interactive-tutorials,revzim/interactive-tutorials,revzim/interactive-tutorials,ubear/interactive-tutorials,daftano/interactive-tutorials,GenericSnake/interactive-tutorials,like9729/interactive-tutorials,ubear/interactive-tutorials,like9729/interactive-tutorials,ubear/interactive-tutorials,ronreiter/interactive-tutorials,ubear/interactive-tutorials,revzim/interactive-tutorials,GenericSnake/interactive-tutorials,GenericSnake/interactive-tutorials,like9729/interactive-tutorials