The defaultView property defines the action default property whether a
default view (i.e. button) must be displayed for a given action.
Usage
defaultView values:
- NO indicates that no default action view must be displayed for this
action.
- YES indicates that a default action view must always be displayed for this
action, if the action is visible (setActionHidden).
- AUTO means that a default action view is displayed if no explicit action view
is used for that action and the action is visible (setActionHidden).
The default is AUTO.
This property applies to the actions defined by the current dialog in the current window.