cl_gui_alv_grid->set_table_for_first_display

Hi

I have a TOP_OF_PAGE with text with total counts of the current column displayed in the table

I am currently using this 
cl_gui_alv_grid->set_table_for_first_display 

bolivs22_0-1708938641722.png

my problem is after hiding some of the columns in the report the count is not updating , I putted the logic for count inside the FORM top_of_page but the top_of_page is only works after executing the program

how can I update the count in the top_of_page by hiding the columns without exiting the report? 

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