Well, we have come to find out that as soon as Dax sees that manual lock up, he takes off his shoe and reaches with his toes and locks it!! Little goober!!
It's a fun game for him!! We have now noticed he is quite limber and good with his feet!! I even saw him holding his sippy cup with his hands and feet while drinking it the other day!! Needless to say, even though it is a little funny, we are proud of his newfound ability!! :)