Checkbox column in TAdvColumnGrid

One of my columns in a TAdvColumnGrid has an edCheckBox editor. but the CheckBox only appears when I am editing. I would like the column to always show that column as a checkbox. Now it shown the CheckFalse of CheckTrue value (default N or Y) in that column, instead of the checkbox.

It is by design that specifying just edCheckbox as inplace editor, that the checkbox only appears when the cell is being edited.
To have an always visible checkbox, please use grid.AddCheckBox()

Ok, clear. And how do I set this checkbox?

See from page 70:

Thank you.