I working with NSxxx kind of controls. It is OS X project.
I expect to see the drop-down control "Event" between the fields "Name" and "Type", with the list of the control library events.
Why I can not see it?
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Most NSControl subclassed objects are simple enough that you just respond to an @IBAction, and that is the "event." For more complex controls you can create outlets to a delegate and sometimes to a datasource as well (e.g. NSTableView).
Your question indicates you're using an NSSlider, and that is perhaps best dealt with using bindings in Xcode, not IBActions.
Aarhus88
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By the way: "How to achieve all the list of actions/events of the control easy and quick?" – Ruben Kazumov Nov 18 '15 at 00:56