For those wondering how to use the weather radar inside of the PMDG 777 here's a quick tutorial 

• The first thing you'll want to do is turn on the WXR on the EFIS Panel 
• Then you'll want to look near the radio panel and turn on WX+T on both the top and bottom 
• You'll then notice in a sweeping pattern the weather and turbulence being painted on the ND! 

Now you can enjoy a working weather radar in the PMDG 777!