R help - Dec 2011 - Estimating a latent class multinomial logit regression with flexmix

I am trying to estimate a latent class multinomial logit regression with
flexmix.

I am not sure if I should do it as follows: 

m4<-flexmix(cbind(y,1-y)~x1+x2|id,model=FLXMRglm(family="binomial"),data=NPreg,k=2)
,

where id links each row with the corresponding respondent.
 Each respondent has 4 alternatives to chose from.
y takes the value 1 only for the alternative chosen;
 x1 and x2 are alternative-specific variables (thus they take different 
values in each row)

I will much appreciate your help.

thanks in advance

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