extjs 4.0 combobox 下拉文本显示自动变宽

 1  items: {
 2                                 xtype: ‘combobox‘,
 3                                 displayField: ‘name‘,
 4                                 labelAlign: ‘right‘,
 5                                 valueField: ‘num‘,
 6                                 matchFieldWidth:false,//默认是true,改成false下拉内容就自动变宽显示在一行了
 7                                 value: ‘all‘,
 8                                 queryMode: ‘local‘,
 9                                 store:
10                                     new Ext.data.Store({
11                                         fields: [‘name‘, ‘num‘],
12                                         data: [{ ‘name‘: ‘11111111111111111111‘, ‘num‘: ‘all‘ },
13                                             { ‘name‘: ‘2222222222222222222222‘, ‘num‘: ‘10‘ },
14                                             { ‘name‘: ‘3333‘, ‘num‘: ‘0‘ },
15                                             { ‘name‘: ‘444‘, ‘num‘: ‘-10‘ }]
16                                     }),
17 }