RetrieveData?    (Sorry - have to ask <g>  ).
Yes.....

(Wonders what stooopid thing he has missed....)

does the TSimpleDataLink.RetrieveData declaration
have the "override" keyword?
 
If it doesn't - it's hiding the abstract one but
not overriding it.   (I get nailed by this when
I case ... i mean switch from C++)
 
(not sure that would cause the problem you
describe though).
 
-ns

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