Sets the specified controller bar button to be visible or invisible, according to the state parameter.
Original signature is '- (void)setStepButtonsVisible:(BOOL)state'
Available in 1 or later and later.
- state (Boolean)
- MISSING
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)