Object GPHBOX

Has anyone used the GPHBOX object ?

It's another one of these hidden ones that I can't find any information on or examples

I want to draw a box showing the volume of a beam / plate / negative etc

!Vol1 = object GPHBOX(!!ce)

Then there are options beyond that, such as setting it's visibility, ORI, POS, XLength, YLength, ZLength etc

I have tried setting these with no success

Any help is appreciated