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Problems evaluating Grad


I'd like to detrmine Grad to a function so i go:
<<Calculus`VectorAnalysis`
f[x_,y_]:=x+y

Grad[f[a,b]]

I get no errors, but the answer is simply the same thing
that i asked, as if no computation was done. What do i
do wrong?

Also - when i evaluated the examples in Help i got the same
behavior. The answer that already is there gets exchanged
to something else upon my evaluation. Namely, the question
itself. What is that?!

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Konrad
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