Rendering via Maxscript to VrayVFB

I have tried the line:

render VFB:false

to make a “test render” window. It renders ok, but the VFB exits upon rendering and I don’t seem to be able to get it display if I do vr.showlastVFB()
So how do I get maxscript to create a render in the VFB just as if I had pressed f9 or pressed render on the render settings dialogue.

Raj

I think I found the answer:
" max quick render "

how do I delete thread?

Not sure that you have permissions to do that.