 
 subsubsection3_3_5_6.html  subsection3_3_5.html  subsubsectionstar3_3_5_4.html  tableofcontents3_1.html   Next: subsubsection3_3_5_6.html Accessing the Value Up: subsection3_3_5.html The TixSelect Widget  Previous: subsubsectionstar3_3_5_4.html  Accessing the Button    Specifying Selection Rules  
For simple selection rules, you can use the 
-allowzero and -radio options. The -allowzero option specifies whether the user
  can select none of the choices inside the TixSelect widget. The 
-radio option controls how many buttons can be selected at once: when
  set to true, the user can select only one button at a time; when set to
  false, the user can select as many buttons as he desires.
With these two options, we can write a program using two TixSelect widgets
  for little Jimmy to fill up his lunch box. On the Sandwich side, we set
  
-radio to true and -allowzero false. That means Jimmy
  can select one and only one sandwich among beef, cheese or ham
  sandwiches. On the Veggie side, we want to encourage Jimmy to consume as
  much veggie as possible, so we set the 
-allowzero option to false. We also set the -allowzero option to false so that
  Jimmy cannot get away with eating none of the vegetables (see program
  1-13).
  tixSelect .sandwich -allowzero false -radio true -label "Sandwich :".sandwich add beef   -text Beef
.sandwich add cheese -text Cheese
.sandwich add ham    -text Ham
tixSelect .vege -allowzero false -radio false -label "Vegetable :"
.vege add bean    -text Bean
.vege add carrot  -text Carrot
.vege add lettuce -text Lettuce
(Figure 1-13) Specifying Simple Selection Rules    
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