Adjusting column widths of PropertySheetView

I was looking for a way to adjust the PropertySheetView so that instead
of the default width of the two columns (name/value) being the same
size, I'd like to have the first Name column to be smaller than the
second. One of the properties I have shows the file path of a
FileObject, which is quite long. Since I have the UI space, I'd like
the Value column to be longer.

I searched for an easy way to access the enclosed SheetTable so that I
could grab the columnModel and suggest a maximum size for the first
column. I wasn't able to do this even after creating a new class
extending this one. Does anyone have any other suggestions on how to do
this?