.FirstXRefInDoc not working

Hello,

I try to parse xrefs in a doc (and update them), but I have trouble getting the reference to fist xref.

var comp = doc.FirstXRefInDoc;

returns undefined, although there are xrefs in a file. I work in FM 10.

also global update doc.UpdateXRefs does not seem to have any effect.

When I do manualy Edit - Update references, xrefs in document get updated. Are these properties and methods tied to FM11, in that case, what options I have in FM10?