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# Critical message with title and buttons.
# Returns 0 (OK), 1 (Cancel), 2 (Details)
set button [qcritical Error "Failed to open file" OK Cancel Details]
if { $button == 0 } {
# OK button was pressed
} elseif { $button == 1 } {
# Cancel buttons was pressed
} elseif { $button == 2 } {
# Details buttons was pressed
}
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Example #Critical Critical dialog with extra buttons shows a warning dialog with a title and extra buttons. The number 0, 1, or 2 is returned to the program, depending on which button the user clicks.