nl_tokens: Add or removes a class based on if the class is already added to the Component .
pl_tokens: function ( className , /* private */ <mask> ) { var oldCls = this . getCls ( ) , newCls = ( oldCls ) ? oldCls . slice ( ) : [ ] ; if ( force || newCls . indexOf ( className ) == - 1 ) { newCls . push ( className ) ; } else { Ext . Array . remove ( newCls , className ) ; } this . setCls ( newCls ) ; return this ; }