I'm trying to add Scene Builder to Intellij idea 2016 by following this answer but I just see this:

my current solution is by opening it in standalone Scene Builder.
I'm trying to add Scene Builder to Intellij idea 2016 by following this answer but I just see this:

my current solution is by opening it in standalone Scene Builder.
After trying some things I found that it only working with 32-bit version only not with 64-bit which I was using even if I installed Gluon's Scene Builder 64-bit. so I just switched to IntelliJ 32-bit and it worked.
IntelliJ built-in Scene Builder uses the standalone Scene Builder you have installed in your machine by scanning its Java folder, looking for the dist.jar.
It is recommended having the latest version of Scene Builder installed.
I've just tried IntelliJ 2016.1.1 with Gluon's Scene Builder 8.1.1 and it works normally, given the limitations the embedded version has: it doesn't have menus, controller panel, custom controls, ...
The preferred way is opening your FXML files from the built in menu Open in SceneBuilder.