[TR] - I saw that the combobox of the [Tile] package didn't support autocompletion, so I added it using the code from [BWidgets]:

 proc ComboBoxAutoComplete {path key} {
	#
	# autocomplete a string in the ttk::combobox from the list of values
	#
	# Anything that is all lowercase is either a letter, number
	# or special key we're ok with. Everything else is a
	# functional key of some kind.
	#
	# path -> path to the combobox
	#
	if {[string tolower $key] != $key} {return}
	
	set text [string map [list {[} {\[} {]} {\]}] [$path get]]
	if {[string equal $text ""]} {return}
	
	set values [$path cget -values]
	set x [lsearch $values $text*]
	if {$x < 0} {return}
	
	set index [$path index insert]
	$path set [lindex $values $x]
	$path icursor $index
	$path selection range insert end
 }

All you need to do now, is binding <KeyRelease> to this procedure:

 package require Tk 8.5
 package require tile
 ttk::combobox .c -values [list one two three four five six seven]
 pack .c -padx 5 -pady 5
 bind .c <KeyRelease> [list ComboBoxAutoComplete .c %K]

[CLN] 2006-04-20 - Shouldn't this be in a namespace or at least be named ttkComboBoxAutoComplete?  For that matter, why not submit a patch to get this into the Tile distribution.  (Not that I wouldn't be grateful to have it available here in the mean time if I was using Tile.)

[TR] 2006-04-21 - I just read the tile paper [http://www.t-ide.com/tcl2005e/2_tile-eurotcl2005.pdf.gz] by [Rolf Ade]. It mentions autocompletion code in the demos directory of the tile distribution. I haven't used that code yet, but it seems to do the same job as the code above, just in the correct namespace and as a command like
 tile::combobox::enableAutocomplete
So, the above code is not needed, really ...