Hi,

Try this solution:

1. You create new class base on CONTAINER control and add CHECKBOX control with it's caption = '' on it. The name of checkbox is chk (Just example).

2. Write following code in INIT event of new class

WITH THIS && container
.Width = .Parent.Width
.Height = .Parent.Parent.RowHeight - 2

.chk.Left = INT((.Width - 15)/2)
.chk.Top = INT((.Height - 15)/2)

.ActiveControl = .chk
ENDWITH

3. Add new class to replace control on column of grid.

Remember set SPARSE property of column is .F.

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Danh,