Applying Weights in SEM Builder

Hello,

I am running a confirmatory factor analysis in which I want to apply an importance weight. The syntax for the model is something like:

sem L-> x1 x2 x3 x4 x5 [iweight=weight]

I would like to get the pretty picture with the estimation results using the SEM builder. My problem is I cannot figure out how to specify the iweight in the builder. Any ideas?

Thanks,
James