ie7.0 combo显示问题

Question

combo在firefox下是正常显示的，在ie下只现实空标签的“请选择....”。
alert时，显示控件中是有值的，只是在ie 中不显示。
有没有人 遇到过这样的问题啊？ 

Answer 1

var gz_time = new Ext.data.SimpleStore({
        fields: ['op', 'display'],
        data : [                
         ['1', '1天'],
                ['7', '7天'],
                ['15', '15天'],
                ['30', '30天'],
                ['90', '90天'],
                ['180', '180天']
            ]
        });
{           
                            id: 'ctrl_svc_log_gz',
                            xtype:'combo',
                            readOnly:true,
                            allowBlank:false,
                            store: gz_time,
                            valueField:'op',
                            displayField:'display',
                            typeAhead: true,
                            mode: 'local',
                            triggerAction: 'all',
            emptyText:'请选择...',
                            selectOnFocus:true,
                            labelSeparator:'',       hiddenName: 'strctrl_svc_log_gz'                                               
                        }