Vista - How to make a FCE/Table & its columns auto-fit/expand

Greetings, All,

Maybe I'm missing something obvious, due to my focusing on
the UIElement/FrameworkElement/Control side of the WPF
class hier, but I'm having some difficulties with
FrameworkContentElement/TextElement/Block/Table.

I can't get the columns in a table to auto-fit to their contents
or get the table itself to shrink/expand to the
contents or available visible page size. All that seems available
to me is either specifying fixed numerical column widths or just
leaving the ColumnDefinition with the value that the default
constructor gives (which gives equal spacing to each column
within the fixed width specified for the FlowDocument that holds
the actual Table). Note that giving some columns a '*' multiplier
relative to the other columns will not help.

My use is for dumping live data into a series of tables within a
subclassed top-level window that is merely a shell for the
generated content a la:

Window
FlowDocumentScrollViewer
FlowDocument
Tables... & other Block content

Note that this is readonly output.

What are my options here?

Thanks in advance,
Robert McCall