ExtJS Combobox 如何设置默认和取值问题

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学习ExtJs，如何给combobox选中某一行，取值问题。
following is for stores combobox
var readerLocation = new Ext.data.WCFJsonReader({
    root: 'data', id: 'Store', totalProperty: 'totalCount',
    fields: [
            { name: 'Store', type: 'int' },

{ name: 'StoreName', type: 'string' }

/*0:'All', '1':'ShangHai', '2':'BeiJing' */

        ]
});
var storeStore = new Ext.data.Store({
    proxy: new Ext.data.WCFHttpProxy({
        url: '/*.svc/GetStoresList'
    }),
    reader: readerLocation,
    remoteSort: true,
listeners: {
        load: function() {
            comboLocation.setValue(comboLocation.getValue());
        }
    }
});
var comboLocation = new Ext.form.ComboBox({
    store: storeStore,
    displayField: 'StoreName',
    valueField: 'Store',
    id: 'comboboxStore',
    typeAhead: true,
    mode: 'local',
    triggerAction: 'all',
    selectOnFocus: true,
    value: '',
    width: 180,
    applyTo: 'ddlStore'
});
storeStore.load();
storeStore.on("load", onstoreStoreLoad, storeStore, true);
function onstoreStoreLoad() {
    if (storeStore.getTotalCount() > 0)
        comboLocation.setValue(storeStore.getAt(0).data.Store);
}
/*** above is for location ***/

点击按钮取值like：

Ext.get("btnFilter").on("click", displayGrid);

function displayGrid() {
var storeFilter = comboLocation.getValue();
});