GridRowView grv=GridView1.Rows[0];
GridView gv=(GridView)grv.FindControl("GridView2");
GridRowView grv2=gv.Rows[0];
CheckBox chk=(CheckBox)grv2.FindControl("CheckBox1");
repeater嵌套vs2005
http://pwqzc.cnblogs.com/archive/2005/12/31/308923.html
repeater嵌套CheckBoxList实现嵌套绑定
http://bbs.bc-cn.net/Article/20066/19/73399.html
http://www.zhoulang.cn/article.asp?id=46