你可以把toolbar放入到panel里不就好了~

var data = [['value1', '点对象'], ['value2', '线对象'], ['value3', '面对象']];
        var store = new Ext.data.SimpleStore({
            fields: ['value', 'text'],
            data: data
        });
        var combo = new Ext.form.ComboBox({
            store: store,
            emptyText: '请选择编辑的图层',
            mode: 'local',
            triggerAction: 'all',
            displayField: 'text'
        });

        combo.on("select", function(comboBox) {
            alert(comboBox.getRawValue());
        });
        var panel = new Ext.Panel({
            renderTo: "map_div",
            region: 'center',
            style: 'border-left:solid 1px',
            border: false,
            tbar: [{
                text: '全幅显示',
                iconCls: 'quanping',
                handler: function() { document.getElementById("map").contentWindow.ViewEntire(); }
            }, '-',
            combo]
        });

这样就可以了啊