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Now it's time to put our knowledge about host widgets, display items
  and display styles into practice. The following example code creates
  two items in a TixTList widget using the 
insert method:
  tixTList .tpack .t
.t insert end -itemtype text -text "First Item"  -underline 0
.t insert end -itemtype text -text "Second Item" -underline 0
set picture [image create bitmap -file picture.xbm]
.t insert end -itemtype image -image $picture
As we can see, the 
insert method of TixTList is very similar to the
  
insert method of the standard Tk listbox widget: it inserts a new
  item into the TixTList widget.  The first argument it takes is the
  location of the new item. For example 
0 indicates the first
  location in the list, 
1 indicates the second location, and so
  on. Also the special keyword 
end indicates the end of the list.
   Then, we can use the 
-itemtype switch to specify the type of
  display item we want to create. There are currently four types of items
  to choose from: 
text, image, imagetext and window. In the above example, we create two items of the type text  and one item of the type 
image. The subsequent arguments to the
  
insert method set the configuration options of the individual
  attributes of the new item.
http://tix.sourceforge.nethttp://tix.sourceforge.net 