Hi Gyaneshwar,
When user should be able to tab into a field you have to specify a tab order and the field may not be protected.
To prevent editing you may use the DisplayOnly propery. Unfortunltely only the edit styles Edit, InkEdit and RichText have this property!
If you need other edit styles I don't know a native way in the datawindow to have the column readonly and focusable. But you could use the itemchanged event to reset changes the user makes.
If you need to check whether the user tabbed into a field you can use the itemfocuschanged event.
HTH,
René