How can I default a checkbutton to be "checked"?

[mucklow]

Is there a way to default a checkbutton to be checked initially?

Something like:

checkbutton $w.b1 -text "test" -variable whatever -relief raised and I'm looking for -initial_value checked

or something like that. Any ideas? Nothing has worked so far.

 

[raider2001]

How about adding the line:

$w.b1 select

 

[mucklow]

Excellent, thank you very much!