[Gtk-sharp-list] What's the best way to display fractions in a TreeView

[Slug]

I'm really having a lot of trouble figuring out how I should go about
displaying a bunch of numeric values as fractions in a TreeView.  If I
convert them to strings and load them into the model, then the sorting is
all out of order when I click on the column header.  It looks like this
(which is wrong):
     1    1/4
     11  1/2
     2    3/4

Is there a delegate I can invoke in the TreeStore or on CellRendererText
where I can stick the code that converts the raw numeric values in the model
to the formatted strings that get displayed in the end?   Or, do I have to
create a subclass 
( e.g. CellRendererFractionText : CellRendererText )  and then override the
Render method.  This seems like a huge hassle for something so common -
especially because there are no simple examples on how to do this for just a
simple little bit of read only text.   

I must be totally missing something big and obvious  - what is it ? 

thx - Slugs

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