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The following code demonstrates how to create a TixControl widget and
  specify its options:
     tixControl .lawyers -label Lawyers: -max 10 -min 0    .lawyers config -integer true -step 2
This example creates a TixControl widget that let us to select the
  numbers of lawyers we wish to be allowed in this country.  (Figure
  1-2)
Let us examine the options: the 
-label option specifies a
  caption for this widget. The 
-max option specifies the maximum
  number of lawyers we can choose. The 
-min option specifies the
  minimum number of lawyers we can choose: although we would love to
  enter a negative number, reality dictate that the lower limit must
  be zero. The 
-integer option indicates that the number of
  lawyers must be an integer; that is, we respect the lawyers' rights
  not to be chopped up into decimal points. Finally, since lawyers
  seem to go in pairs, we set the 
-step option to 2, which
  indicates that when we press the up/down arrow buttons, we want the
  number of lawyers to go up and down by two each time.
   
As shown in the example, you can create and manipulate a Tix widget
  in the same manner as the standard Tk widgets. The options of the
  widget can be specified during the creation of the widget.
  Alternatively, they can be changed by the 
configure widget
  command.  In addition, options can also be specified in the option
  database or as X resources. Here is an example that produces the
  same result as the previous code fragment:
     option add *lawyers.max 10    option add *lawyers.min 0
    tixControl .lawyers -label Lawyers: -integer true
    .lawyers config -step 2
In figure 1-3, you can see the composition of
  TixControl: it is made out of a label widget, an entry widget and
  two button widgets. Widgets that are composed of other widgets, like
  TixControl, are called 
mega-widgets. Most widgets in the Tix
  library are mega-widgets (xx: and as you know this book is about
  them!).
   
http://tix.sourceforge.nethttp://tix.sourceforge.net 