Returns the number of buttons in the button bar
Adds a button to the button bar
Closes the popup and passes a value to be used as a return value. For the modal popups, this value will be the resolved value of the promise returned by the showModal() method. For modeless popups, this value will be available as the returnValue property.
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The IPopup interface represents a popup from the point of view of the content. This interface is published as a service and can be used by the content components to close the popup.