Place signature & DigSigHFT (Acrobat Plug-in [C++])

Hello All
I have problems with operation "Place signature" in Adobe Acrobat Prof
I get sigField==null in callback function DSNewSigDataWithParams after user place signature inside document with help of "Place signature" button.
I see only DigSigBBox in parameters with size of new signature.
How I can get position of new signature from Acrobat?

Example of code:
ACCB1 DSSaveType ACCB2 DSNewSigDataWithParams(DigSigNewSigDataParams sigParams, void **pSigData)
if (CosObjEqual(sigParams->sigField, CosNewNull()))
//I need to create new signature field here, but I don't know positon of new signature in document
//I only know size of new signature (I can get it from sigParams->bb)
1. Is it bug in Acrobat?
2. Maybe can I use other callback functions to get position of new signature?
3. Maybe must Acrobat create signature by self and put it to DSNewSigDataWithParams?

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