* because we search for binding by attribute only in constraints and for unique key columns which are unique?
* But what PK has struct type?
*
* TODO: fix command handlers. Replace activeControl handler with activeEditor. It also fixes standard shortcuts problem (http://dbeaver.jkiss.org/forum/posting.php?mode=reply&f=2&t=1247)
* TODO: links in both directions, multiple links support (context menu)
* TODO: not-editable cells (struct owners in record mode)