extjs4上拉框（ComboBox）无法正确分页解决方案

extjs4下拉框（ComboBox）无法正确分页解决方案
extjs4改动很大，bug也很多！
一直在踩雷的过程中……
本人目前版本为4.0.2a
问题：
下拉框的分页不能正确翻页，如下为出问题的代码：

{                            name: 'submitterId',                            fieldLabel: '提交人',                            xtype: 'combo',                            triggerAction: 'all',                            queryMode: 'remote',                            hiddenName : 'id',                            minChars : 1,                            queryParam: 'nickname',                            store: submitterStore = Ext.create('Ext.data.Store', {                                proxy: {                                    type: 'ajax',                                    url: 'saler/getQuerySalers.json',                                    method: 'POST',                                    reader: {                                        type: 'json',                                        totalProperty : 'page.totalCount',                                        root: 'page.result'                                    }                                },                                pageSize : 2,                                fields :[{                                    name : 'id'                                }, {                                    name : 'nickname'                                }]                            }),                            valueField: 'id',                            displayField: 'nickname',                            listConfig : {                                minWidth: 280                            },                            pageSize : 2                        }

Ext.apply(Ext.form.field.ComboBox.prototype, {        doQuery: function(queryString, forceAll) {            queryString = queryString || '';            var me = this,                qe = {                    query: queryString,                    forceAll: forceAll,                    combo: me,                    cancel: false                },                store = me.store,                isLocalMode = me.queryMode === 'local';            if (me.fireEvent('beforequery', qe) === false || qe.cancel) {                return false;            }            queryString = qe.query;            forceAll = qe.forceAll;            if (forceAll || (queryString.length >= me.minChars)) {                me.expand();                if (!me.queryCaching || me.lastQuery !== queryString) {                    me.lastQuery = queryString;                    if (isLocalMode) {                        if (forceAll) {                            store.clearFilter();                        } else {                            store.clearFilter(true);                            store.filter(me.displayField, queryString);                        }                    } else {                        Ext.apply(store.getProxy().extraParams, me.getParams(queryString));                        store.load();                    }                }                if (me.getRawValue() !== me.getDisplayValue()) {                    me.ignoreSelection++;                    me.picker.getSelectionModel().deselectAll();                    me.ignoreSelection--;                }                if (isLocalMode) {                    me.doAutoSelect();                }                if (me.typeAhead) {                    me.doTypeAhead();                }            }            return true;        }    });