back to alv

dear all expert, i have a little problem

i make a graph in screen 100, and make a custom button to call this screen 100

i want back to alv grid when i push a back button.

when i use leave program the program is closed, ehen i use leave to screen 1000 is not back to alv but its back to selection screen

please help me, i want back to alvgrid when i push back or exit button