Is there any function like

IsDefined("MyClass")

that tells me if MyClass is defined? I need this function in a loop where the class name is constructed at runtime and, if defined, an object will be instantiated. e.g.

for Loop = 1 to MaxClass
  NewClass = ConstructClassName(Loop)
  if IsDefined(NewClass)
    oObject = CreateObject(NewClass)
    * do something
  end
endfor

Thanks