public static Tr AddTable(this Tr tr, Table table)
 {
     tr.AddChildInner(table);
     return(tr);
 }
 public static Tr AddTh(this Tr tr, string content)
 {
     tr.AddChildInner(new Th(content));
     return(tr);
 }
 public static Tr AddTd(this Tr tr, Td td)
 {
     tr.AddChildInner(td);
     return(tr);
 }
 public static Tr AddTh(this Tr tr, Th th)
 {
     tr.AddChildInner(th);
     return(tr);
 }
 public static Tr AddChild(this Tr tr, IChildOfTr childofTr)
 {
     tr.AddChildInner(childofTr);
     return(tr);
 }