nl_tokens: Shorthand for adding a single key listener .
pl_tokens: function ( key , fn , scope ) { var keyCode , shift , ctrl , alt ; if ( Ext . isObject ( key ) && ! Ext . isArray ( key ) ) { keyCode = key . key ; <mask> = key . shift ; ctrl = key . ctrl ; alt = key . alt ; } else { keyCode = key ; } this . addBinding ( { key : keyCode , shift : shift , ctrl : ctrl , alt : alt , fn : fn , scope : scope } ) ; }