checkbox in grid

Question

Hi, My web datagrid contains a checkbox for each row. The grid is populated using autogenerated columns set to true. One of the columns of the grid is called FielID. The result in the grid is ordered by FileID. If there are repeated FileIDs, then I would like to have one Checkbox in the row, instead of one for each similar FileID row. This is what I currently have How can I do this please? Thanks