SnapshotRequestVar.scala

case object MyTabGroup extends RequestVarSnapshotGroup

object MyVar1 extends SnapshotRequestVar(MyTabGroup, "foo")
object MyVar2 extends SnapshotRequestVar(MyTabGroup, 42)
  
def render = {
  /**
    * when this function is applied,
    * it will restore the values of all the members of the MyTabGroup
    */
  val snapshot: () => Unit = RequestVar.snapshot(MyTabGroup)
  ...
  "type=hidden" #> SHtml.hidden(snapshot) &
  ...

}