Determines whether the user can change the value of the field.
property ReadOnly: Boolean;
Use the ReadOnly property to specify whether the barcode component specified in the Barcode property of a TDBBarcode component allows the user to change the field value by changing the value of its Barcode property. When the ReadOnly property is set to true, the barcode component can only be used to represent the value of the field on the current record. When the ReadOnly property is set to false, the user can change the field value by changing the Barcode property value of the barcode component specified in the Barcode property of the TDBBarcode component.