Checkbox select all doesnt work

sorry it still doesn't work,

for my case it's cells[1], cells[0] is the edit button.

sinceGridVwHeaderChckbox.rows[i].cells[1] is already referring to the checkbox, why can't I just GridVwHeaderChckbox.rows[i].cells[1].click()?

I've tried GridVwHeaderChckbox.rows[i].cells[1].checked = true; i'm able to set it to true however the checkbox didn't tick.

Achived using JS,