Silverlight中后台获取样式的方法

ComboBoxItem conboxitem = new ComboBoxItem();
conboxitem.Style = App.Current.Resources["ComboBoxItemStyle1"] as Style;
conboxitem.Content = string.Format("{0}年", DateTime.Now.Year - i);
conboxitem.Tag = DateTime.Now.Year - i;
this.cboxYear.Items.Add(conboxitem);