Collapse and Expand behaviour on result with 1 document.

[Derek Poh]

Hi

I have a query which return 1 document.
When I add the collapse and expand parameters to it, 
"&expand=true&expand.rows=5&fq={!collapse%20field=P_SupplierId}", the 
expanded section is empty (<lst name="expanded"/>).

Is this the behaviour of collapse and expand parameters on result which 
contain only 1 document?

-Derek