ext3.4工具条字段太多如何换行

    var ManagerGrid = new Bicycle.BaseClass.BaseGrid({      id :ManagerGridId,      height:1000,      cm : cm,      sm : sm,      autoExpandColumn : 0,      items:[{         tbar : opToolbar,         listeners: {            'render': function () {               opToolbar.render(this.tbar); //add one tbar               opToolbar1.render(this.tbar); //add two tbar//                      threeTbar.render(this.tbar); //add three tbar            }         }      }],      store : realStore      //bbar : pagetb   });

opToolbar1 = new Ext.Toolbar({   items : [      {         xtype:"panel",         html:'车3123牌:'      }]})// 定义工具栏按钮var opToolbar = new Ext.Toolbar({   items : [{xtype:'panel',html:'dsasa'}] }]