measure layout

Hi,
First, I just want to thank whomever for this program. I've used Finale for years and I never got comfortable with it. I started using MuseScore yesterday and I already feel at home with it. Great job.

So, what I am trying to do is put a line break at the end of a measure but not have the measure fill up the rest of the system (or line, whatever). As it is, I've got one measure filling up the entire line which I don't want. I've played around with breaks, frames, stretch, and plug-in break x-measure but I am still not getting what I am after.

So, in summarizing, is there any way of making a line break without having the previous measures stretch out to fill the whole line?

Thanks