StrangeBrew Java Project

I have had trouble with these which Drew knows about
but now I have things running, if I click a malt or hop
drop down the field blanks out while the drop down list
appears. If I don't choose new amlt or hop the field
stays blank until I click on another box. However, if I
pick a new malt or hop and then go to a different malt
or hop it automatically changes to the one I changed
the first one to. If I click on units such as pounds,
when the drop down box appears the field stays filled
and if I pick a new unit then go to another unit field
it all works perfectly. It looks like there is
something different in the way the fermentables/hops
fields are implemented compared to the units