Specifies whether the alert has a help button.
- macOS 10.3+
Set this property’s value to
YES to specify that the alert has a help button, or
NO to specify it does not.
When a user clicks an alert’s help button, the alert delegate (
delegate) receives an
alert message. The delegate is responsible for displaying the help information related to this particular alert.
Clicking an alert’s help button can alternately cause the
open message to be sent to the app’s help manager with a
nil book and the anchor specified by the
help property, if any of the following conditions are true: