Bending and throat vibrato

[<shankar@xxxxxxxxxxxxxxxxxxxxxxx>]

This might be a pretty basic question but anyway,
here goes.
I want to know if one can bend a note and simultaneously
use throat vibrato on the note.
I can use these techniques independently but when I try
to vibrato the bent note I lose the bend.
I think Sonny Boy (II)
uses this on some of his songs ( esp intro to All My Love
In Vain 10th bar ) - or is it something entirely different
which I am missing.
Thanks in advance
Shankar.