create instance from reflected type

Hi!

I am using reflection to find all derived classes. I want to be able to add instances of classes in editor(im trying to make a behaviour tree), based on classes that are derived from Node class, but I dont know how to use found types for casting. I have tried generics, with the same outcome. Help please!

 class Node 
 {
     Node node;
 }
 
 class ActionNode : Node
 {
 
 }
 
 class Test
 {
     System.Type[] types;
 
     Node someNode;
 
     void Start()
     {
         types = System.Reflection.Assembly.GetAssembly(typeof(Node)).GetTypes();
         foreach(System.Type refType in types)
         {
             if(refType.IsSubclassOf(typeof(Node)))
             {
                 someNode = ( ????? )System.Activator.CreateInstance(refType);
             }
         }
 
     }
 }