Hi Akira, you mean you want to hide surface objects? Or do you want to hide faces and leave edges showing for a wireframe type display?

You can use the scene browser for this - go to the scene browser, Types section and to hide surfaces left click the eye icon for the Surfaces entry there. To isolate them right click on that same eye icon, that will hide everything else other than surfaces. A second right click on it will show everything again.

For a keyboard shortcut for hiding surfaces, set up a shortcut key with this script on it:

script: /*Hide all surface objects */ moi.geometryDatabase.getObjects().getSingleFaceBReps().setProperty( 'hidden', true );

- Michael