Lists the values used to specify which buttons should be visible in a pop-up footer.
There are no buttons in a pop-up's footer.
A pop-up's footer displayes two buttons:
The OK button that closes the editor and applies changes to the editor's value;
The Cancel button that also closes the editor and discards all changes.
There is only the Close button in a pop-up's footer. This buttons acts in the same way as the Cancel button (closes the editor and discards changes).