nl_tokens: Parses a direct function . It may be passed in a string format for example : MyApp . Person . read .
pl_tokens: function ( fn ) { if ( Ext . isString ( fn ) ) { var parts = fn . split ( '.' ) , i = 0 , ln = parts . length , <mask> = window ; while ( current && i < ln ) { current = current [ parts [ i ] ] ; ++ i ; } fn = Ext . isFunction ( current ) ? current : null ; } return fn || null ; }