How to create Map of Class type in scala

There is one use case, where i am trying to create a Map of String and Case Class type.

For example:

  case class CaseClass1(foo: String, bar: String)
  val myCaseClasses = Map("1" -> CaseClass1, "2" -> CaseClass2, "3" -> CaseClass3)

And using myCaseClasses map, i am want to iterate through all the classtypes and pass that type to another function (Just trying to replicate my use case, its not working code).

  def nullFillForCaseClasses(init: String]) = {
    myCaseClasses.foldLeft(ds) {
      case (str, (classNo, classType)) =>
        str + getNullClassOf[lobType.type](classNo)
    }
  }

  def getNullClassOf[T <: Product : TypeTag](classNo: String): String = 
                                                         someFunction[T](classNo)

I am not sure this is possible by scala or not. This can be done by simple if else or pattern matching, but playing with scala and figuring other ways also.