Unable to watch 3D movie using active glasses on panasonic tv

I have got 3D active glasses for my panasonic TX-55CX700B tv and the 3D function on the tv remote control is highlighted out so i cannot change any option when a 3D movie side by side is playing.
Is there any way to do it on kodi. I followed some you tube videos but no luck. I have 3D movies on Kodi and when playing them i get a side by side image.
How i do get the 3D button to appear on the menu bar when playing a 3D movie?
basically how do i get 3D to work using active 3D glasses on my panasonic tv when playing 3D movies using Kodi 16.1
help is much appreciated.