nl_tokens: Collects unique values of a particular property in this MixedCollection
pl_tokens: function ( property , root , allowNull ) { var values = this . extractValues ( property , root ) , length = values . length , hits = { } , unique = [ ] , value , strValue , i ; for ( i = 0 ; i < length ; i ++ ) { value = values [ i ] ; strValue = String ( value ) ; if ( ( allowNull || ! Ext . isEmpty ( <mask> ) ) && ! hits [ strValue ] ) { hits [ strValue ] = true ; unique . push ( value ) ; } } return unique ; }