User wanted to make 'Tag Number' field in element info dialog to be 'Read Only' so that users can't edit the name directly. Since 'Parser Expression' is defined in schema on NAME (Tag Number) property therefore it is not possible to make this property read only.
But you can work around this by adding a dummy tag number field.
Bentley's Product Advantage Group requests that you please confine any comments you have on this Wiki entry to this "Comments or Corrections?" section. THANK YOU!