 
 subsubsection3_4_1_4.html  subsection3_4_1.html  subsubsection3_4_1_2.html  tableofcontents3_1.html   Next: subsubsection3_4_1_4.html Changing Page Tabs Up: subsection3_4_1.html TixNoteBook  Previous: subsubsection3_4_1_2.html Keyboard Accelerators    Delaying the Creation of New Pages  
If your notebook contains many complicated pages, it may take quite a
  while to create all widgets inside these pages and your program will
  probably freezes for a few seconds when it pops up the notebook for
  the first time. To avoid embarrassing moments like this, we can use
  the ``delayed page creation'' feature of the TixNoteBook widget.
When we create a page using the add method, we can specify
  the optional parameter 
-createcmd so that we only need to
  create the page when the user wants to see it. This is illustrated
  in program 2-3:
  tixNoteBook .n.n add hd  -label "Hard Disk" -underline 0 -createcmd CreateHd
.n add net -label "Network"   -underline 0 -createCmd CreateNet
proc CreateHd {frame} {
    tixControl $frame.access   -label "Access Time:"
    tixControl $frame.write    -label "Write Throughput:"
    tixControl $frame.read     -label "Read Througput:"
    tixControl $frame.capacity -label "Capacity:"
    pack $frame.access $frame.write $frame.read $frame.capacity 
        -side top -fill x}
proc CreateNet {frame} {
    ...
}
(Figure 2-3) Delayed Page Creation    
In line 2 of program 2-3, we use the 
-createcmd  option to specify that the procedure 
CreateHd should be called
  when the ``Hard Disk'' page needs to be created. 
CreateHd  takes one argument, the frame subwidget of the page. As we can see,
  program program 2-3 is not very different than program
  2-2, except now we can issue less commands during the
  set-up of the NoteBook widget and the interface can be started up
  more quickly.
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