Did yo bother with the other things "Good Luck" suggested?
1) You might try looking at the control's output through a digital camera or mobile phone to check if anything's coming out.
2) You might try selecting the function you need using the TV's built-in control buttons.
To which I could add:
If the remiote isn't transmitting anything when you press the Menu or Internet buttons, you could just try to get a new remote. Thre should be plenty on EBay, but you will need more than "Panasonic" to describe the remote you need. You will have to find out the model number of your set EVEN IF IT MEANS DOING THAT FOR YOURSELF
Travor
May 2016