DataGridView with popup Select Form

hi I am using datagridview in my window application form. I want that when I click on a particular column of datagridview it popup a window having info containing that field. Like I have all data about customer in datagridview, So i can select customer from popup form and set the same to clicked cell.
Same is done and working fine, But the problem is that :

When data is set in datagridview cell no new row appear next to current row, Like when we edit/insert data in normal mode then there is a automatically new row next to edited row.

How can I have same functionality with popup window text.

Vijay :blush:

If any clarity required then let me know.