a(Huge)ComboBox is a pure Tcl megawidget replacing the entry widget of Tk 8.4.
It augments the entry widget with a pick-list and its calling-button. This pick-list is the famous Hugelist (http://perso.wanadoo.fr/maurice.ulis/tcl/Hugelist ) which allows to choose among more than 1,000,000 items without time or memory penalty.
The search is based on the [string match] patterns.
doc & download: http://perso.wanadoo.fr/maurice.ulis/tcl/Hugecombo
See also: http://perso.wanadoo.fr/maurice.ulis/tcl/Tinycombo for a combobox.