aftert trying a few techniques and doing a bit more research I have found out that selecting models (picking) refers to clicking on models in a 3D cast member. Because models are objects that exist
within a 3D cast member and a 3D sprite, they are not normally sensitive to mouse clicks. Normally, only the entire sprite is sensitive to mouse clicks. to overcome this i will have to create scripts to select the sprites and determine which sprite has been clicked on. this has to be done by using cast members or camera methods