T.A.
Hi K.,
I had a similar problem with my now 6 yr old son. He was a true "button boy" and would push every button he could find, and put anything that would fit into any hole he could find. I also had the entertainment center with the opening for the tv, etc with no glass door to protect it. I found the best defense was to slide my coffee table right up to the entertainment center, with no room to walk in between. Peter would use the table to pull himself up to stand, and eventually started climbing on it. But it worked until he was about 2 1/2.
Good luck,
T.