ALV Grid Using Methods-handle_top_of_page

riends please explain how to resolve the below issue.

I am working on ALV Grid using methods & trying to display

page heading using handle_top_of_page event.

I have defined & implemented the above method and in the implementation I have

given a write statement, which has to be displayed on the top of page.

I have also set the handler for top of page.

The program does not have any errors, but top of page event is not triggered, what might be the problem.

Regards,

Usha