var comboStore = new Ext.data.ArrayStore({
               fields: ['id', 'country'],
               autoLoad: true,
               //data : storeArr

               data : [
                           {"id":"1", "name":"Alabama"},
                           {"id":"2", "name":"Alaska"},
                           {"id":"3", "name":"Arizona"},
                           {"id":"4", "name":"ddddddd"},
                           {"id":"5", "name":"sdfsdf"}
                       ]

           });

var combo = new Ext.form.ComboBox({
                id:"combo1",
                renderTo: Ext.getBody(),
                store: comboStore,
                fieldLabel : "select a country",
                displayField:'name',
                valueField:'id',
                typeAhead: true,
                mode: "local",
                triggerAction: "all",
                emptyText:"type country name...",
                selectOnFocus:true,
                width:300
            });

        CountriesWindows.add(combo);
        CountriesWindows.doLayout();

data : [
                        [1, "Alabama"],
                        [2, "Alaska"],
                        [3, "Arizona"],
                        [4, "ddddddd"],
                        [5, "sdfsdf"]
                       ]