From: John Darrington <john@cellform.com.au>

> I've been thinking about this too, and I've got an idea
> which might give a more pleasing gui than that produced by the Chicago
> company:  If we use the features of the GtkTreeView widget, then we
> can present a list of categories and allow the user to expand or
> collapse those categories in which (s)he's interested.  It means that
> the dialog box doesn't have to be cluttered with more widgets, yet
> allows easy filtering and selection of the functions.

...

> All Functions >
>  ABS
>  ARCCOS
>  ...
> Trig Functions >
>  ARCCOS
>  ARCSIN
>  ...
> Stats Functions >
>  BETA.CDF
>  BETA.PDF
>  BETA.IDF
>  GAMMA.CDF
>  ...
> Stats by Distribution >
>  CDF >
>   BETA.CDF
>   GAMMA.CDF
>   ...
>  PDF >
>   BETA.PDF
>   ...
>  IDF >
>   BETA.IDF
>   ...
> Stats by Family >
>  BETA >
>   ...
>  GAMMA >
>   ...
>  POISSION >
>   ...
>  ...