Brown nodes like that one are hidden as they are generally used by NI developers only so they are not as thoroughly tested and documented, etc. (Blue = scripting, red=deprecated).
You should be able to see it if you modify your INI file. If you close LabVIEW, go to the LabVIEW folder (probably C:\Program Files (x86)\National Instruments\LabVIEW 20xx), then open the LabVIEW.ini file, you need to add this line somewhere:
SuperSecretPrivateSpecialStuff=TRUE
The next time you open LabVIEW, this will add a huge amount of extra properties/methods to most of your LabVIEW property/invoke nodes. It adds so many that it's actually hard to find the ones you want in most cases, so I don't add it most of the time.
Also,
if there's a hidden selection on any node, no matter why it's hidden (deprecated, scripting, developer mode, etc.) this should always work to create it (without needing to install anything as an addon or set any INI flags):
1. Create a property or invoke node from the object type you want the hidden property or function of. In this case, it appears to be an Subpanel invoke node.
2. Select the node (and nothing else), then press control-space to bring up the quickdrop window.
3. In the quickdrop window, type in the exact name of the property or function you need (case insensitive, but spacing and punctuation needs to be intact).
4. Press Control-Shift-B.
