refreshing the list

experts,

i have used reuse_alv_grid_display to display a report and used my own pf status and added a pushbutton on the application tool bar named 'refresh'.when ever i am clicking refresh a new list is getting generated overlapping the other,the problem is when i press 'back' the lists generated are equivalent to the number of times i press 'refresh'.

how to overcome this problem (or) how to display the list only and refresh it automatically