Found it. It was the Grid's ReadOnly property.

Thanks to all anyway


>Hi all
>
>I inserted a Checkbox control into a column in order to handle a logical field. I removed the default textbox and I can see the checkbox showing the logical value.
>
>My problem is that the checkbox behaves as read only not allowing me to change its value. I’ve placed code into the interactive change and noticed that it does not fire as expected.
>
>The column.sparse property is .F. in order to show the checkbox.
>
>I’ll appreciate any advice about how to enable the checkbox functionality.
>
>Thanks in advance and regards
>
>
>Oscar Corte