Alv refersh (data)

I made an alv report and i am trying to refresh the data that i changed.

I use the "FUNCTION 'REUSE_ALV_GRID_DISPLAY" .

I don't know where and to use the proper function.

I believe at the "At user command" events i must use it but i don't know how .

If someone can help or has an example....

P.S. I know that already there is a post aboyt alv but i can;t find the solution ...

Thanks

Dimpant