Trigger that identifies RtGet changes

[LeeFrankel]

Hello again,

I have a worksheet containing Reuters live data being fetched with RtGet function:
=AdConvert(RtGet("IDN_RDF","MAL/SELECT1","IRGROW 5"),29,14)

Im trying to keep track of the changes in the information (Commodities Futures),
I need an event (in Visual Basic) that triggers when new content arrives,
Worksheet_Change does not work.

This thread relates to a question I asked here

Thanks to any help,
Lee