Determines whether the user can use the DBRichVewEdit control to change the value of the field in the current record.
property ReadOnly : Boolean;
Set ReadOnly to True to prevent the user from changing the content of the database field. When ReadOnly is True, the edit control is used only to display the content of the field. If ReadOnly is False, the user can change the field's value as long as the dataset is in edit mode.
Note: TRichViewEdit.ReadOnly property is overridden in TDBRichViewEdit to get/set read-only mode in the linked dataset.