}
                    else
                    {
                        ((ToolStripMenuItem)((ToolStripMenuItem)((ToolStripMenuItem)sender).OwnerItem).DropDownItems[i]).CheckState = CheckState.Unchecked;
                    }
                }
                if (((ToolStripMenuItem)sender).Text == "系统默认")
                {
                    RemoveSkin();
                    DataSet skin = new DataSet();
                    skin.Tables.Add("skin");
                    skin.Tables["skin"].Columns.Add("style");
                    System.Data.DataRow dr = skin.Tables["skin"].NewRow();
                    dr[0] = "系统默认";
                    skin.Tables[0].Rows.Add(dr);
                    skin.WriteXml("skin.xml", XmlWriteMode.IgnoreSchema);
                    return;
                }
                foreach (SkinType st in (SkinType)System.Enum.GetValues(typeof(SkinType)))
                {
                    if (st.ToString() == ((ToolStripMenuItem)sender).Text)
                  &nbs