Ext.form.TriggerField.override({
    afterRender : function(){
        Ext.form.TriggerField.superclass.afterRender.call(this);
        var y;
        if(Ext.isIE && !this.hideTrigger && this.el.getY() != (y = this.trigger.getY())){
            this.el.position();
            this.el.setY(y);
        }
    }
});