When to call show()?

[Beast <beast i6x org>]

In some programs I found that people prefer to call show() method just 
after they're creating a new widget, but some perefr to just call 
$window->show_all once in the end of window creation.
Which is better?

For me it's all same, because it doesn't showed anyway if we did not 
call  Gtk2->main


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--beast