UnityEditor.RuntimeClassRegistry.AddNativeClassID C# (CSharp) Method

        public void AddNativeClassID(int ID)
        {
            string name = UnityType.FindTypeByPersistentTypeID(ID).name;
            if (name.Length > 0)
            {
                this.allNativeClasses[ID] = name;
                if (!this.functionalityGroups.ContainsValue(name))
                {
                    this.nativeClasses[ID] = name;
                }
            }
        }