passing arrays to actxServer

I wrote a .dll in VB.net 2003 that I am calling from
Matlab as an actxServer. I am successful in passing most
parameters from Matlab to the methods of the .dll, but I
need to pass an array of double. When I create the arrays
in Matlab and then call the method that expects 2 arrays
of double and 2 strings, I get the following error:

??? Attempt to reference field of non-structure array.

History:
vi = actxServer('VILTC');
exp= vi.createExperiment(103007);
x = [ 1 2 3];
y = [ 4 5 6];
hist = exp.CreateHistoGram(x, y, 'X axis', 'Y axis');
??? Attempt to reference field of non-structure array.

This works when I call from a windows form based
application when I create array in code and then call the
CreateHistoGram method, but my users want to do this from
inside of Matlab.

thanks,
Faron
.

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