How to restrict the key-board operation to change the check-box value?

I have loaded the check-box in the DataGrid cell of a custom column, i like to restrict the Editing operation for that column So that i have customize the Column externally and then make the Check-box property IsHitTestVisible as false to restrict the editing operation for the check-box using mouse.But i am able to change the check-box status using the key-board(Space key). How to avoid this and makes the check-box completely in the non-editable state.