Modifying CollectionEditor in PropertyGrid

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C#

I currently have a list containing Call's, which is the base class. If I want to add derived classes of Call to the list, I know to do the following.

public class CustomCollectionEditor : System.ComponentModel.Design.CollectionEditor
{
  private Type[] types;
  public CustomCollectionEditor(Type type)
    : base(type)
  {
    types = new Type[] { typeof(Call), typeof(BlueCall), typeof(CappedCall) };
  }

  protected override Type[] CreateNewItemTypes()
  {
    return types;
  }
}

public class DisplayList
{
  public DisplayList() { }
  [Editor(typeof(CustomCollectionEditor), typeof(UITypeEditor))]
  [DataMember] public List<Call> ListCalls { get; set; }
}

My questions is there anyway of moving where you mark up the Type[] containing all possible types the list can contain? I thought of adding the following to my CustomCollectionEditor class, but this doesn't work.

public CustomCollectionEditor(Type type, List<Type> types_)
  : base(type)
{
  types = types_.ToArray();
}

It would be ideal if I could mark up which classes the CustomCollectionEditor needed to be aware of in the DisplayList class somehow.