 
 subsubsection3_3_4_4.html  subsection3_3_4.html  subsubsection3_3_4_2.html  tableofcontents3_1.html   Next: subsubsection3_3_4_4.html Monitoring the User's Up: subsection3_3_4.html Another Tix Widget:  Previous: subsubsection3_3_4_2.html Controlling the Style    Static Options  
The 
-dropdown and -fancy options are so-called ``static
  options''.  They can only be set during the creation of the
  ComboBox. Hence this code is valid:
     tixComboBox .c -dropdown true
But the following code will generate an error because it attempts to
  set the 
-dropdown option after the ComboBox has already
  been created.
     TixComboBox .c    .c config -dropdown true
The restrictions of the static options, although annoying,
  nevertheless make sense because we don't want our interface to
  suddenly change its style. If sometimes a button is there and
  sometimes it disappear all by itself, that will certainly create a
  lot of confusion and makes the user wonder why he should buy our
  software. Also, as you will see in chapter 6, having some
  static options will make the life of widget writers a lot easier.
Accessing the value of the ComboBox is very similar to accessing the
  value of the TixControl widget. The ComboBox has these four options,
  which we discussed in section 1.2.2: 
-value,
  
-variable, -command and -validatecmd. You can use
  these four options to access the user input and respond to user
  actions in exactly the same way as discussed in section
  1.2.2.
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