The view displayed when this item is displayed in its parent bar.
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@property(strong) __kindof NSView *collapsedRepresentation;
By default, this is an NSButton whose target is this popover item, whose action is showPopover:, and whose image and title are bound to this item's collapsedRepresentationImage and collapsedRepresentationImage respectively.
The image displayed by the button for the default collapsed representation.
The localized string displayed by the button for the default collapsed representation.