Nesting Groups within Groups

I'm trying to find out if it is possible to nest Groups within Lectora.Actually, I know that it IS possible, because I've done it once... but just once. I somehow placed a group of objects within another group object; however, when I un-nested them, I couldn't re-nest the groups.No matter how many times I tried or key modifiers I used, I can't recreate nested Groups.Does anyone know if this is truly possible, or did I accidentally stumble upon a bug that corrected itself?