Adding a field to a FileBrowserSheet

[Roger and Beth Whitcomb]

I need to be able to specify a character set encoding when opening a 
file, so I was thinking I would put a ListButton with some of the 
choices at the bottom of a FileBrowserSheet.  But, it doesn't look like 
the simple thing of just adding the ListButton component to the 
FileBrowserSheet object (with Sheet.add(xxx)) is going to work.  So, 
would I have to basically implement my own component, subclassing 
FileBrowser in order to do this?  Or am I missing something obvious?

Thanks,
Roger Whitcomb