private void AddToSortLayerList(ReorderableList list)
{
base.serializedObject.ApplyModifiedProperties();
InternalEditorUtility.AddSortingLayer();
base.serializedObject.Update();
list.index = list.serializedProperty.arraySize - 1;
}
void AddToSortLayerList(ReorderableList list)
{
serializedObject.ApplyModifiedProperties();
InternalEditorUtility.AddSortingLayer();
serializedObject.Update();
list.index = list.serializedProperty.arraySize - 1; // select just added one
}