perldoc Tk::HList says

Each list entry in an HList widget is associated with a display item. The display item determines what visual information should be displayed for this list entry. Please see the Tk::DItem manpage for a list of all display items. When a list entry is created by the itemCreate, add or addchild widget methods, the type of its display item is determined by the -itemtype option passed to these methods. If the -itemtype is omitted, then by default the type specified by this HList widget's -itemtype option is used.

Now go read the Tk::DItem docs.
http://perltk.org/ptknews/search.cgi?Search=justify
Re: How do you justify the contents of an HList column?

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