>    I've a really bad problem. I want some columns in my string grid
> (e.g.
> 2nd, and 5th columns) to be read only. I don't know how to do it. Any
> suggestions?
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Use the OnSelectCell event.

ie.

Procedure Tform.YourGridOnSelectCell(Sender: TObject; Col, Row: Longint;
  var CanSelect: Boolean)

BEGIN
   if (col = 2) or (col=5) then YourGrid.options :=
YourGrid.options-[goEditing]

   else                                  YourGrid.options :=
YourGrid.options+[goEditing];

END;