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Dynamic problem (possibly simple)


Hi all,

 I have the following problem: I want to dynamically plot a function
(tangential plane to a 3D Plot) One part is that I have to compute the
gradient of the function. I could not manage this (dynamically). I
have stripped of any unnessesary code to descripe the problem, so look
at this:

This makes a slider to select a point (works well, of course)

{Slider2D[Dynamic[aufpunkt], {{-2, -2}, {2, 2}}], Dynamic[aufpunkt]}

This should do a computation with "aufpunkt" (does not work)

DynamicModule[{x, y, a, b},
 x = Dynamic[aufpunkt[[1]]]; y = Dynamic[aufpunkt[[2]]];
 y^2
 ]

The output is not evaluated, I get, for instance, (0.5)^2, instead of
0.25. How can I manage to get the formula (y^2 in this case)
evaluatet?

Greetings

Mike


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