The following events are generated by the Screen Manager during screen transitions. These events are generated in the following order:
| gre.screenshow.predelivered to target (end)
                            screen | 
| gre.screenhide.predelivered to source (start)
                            screen | 
| gre.screenshow.postdelivered to target (end)
                            screen | 
| gre.screenhide.postdelivered to source (start)
                            screen |