| A menu for page creation in the workbench.
An OpenNewPageMenu is used to populate a menu with
"Open Page" actions. One item is added for each shortcut perspective,
as defined by the product ini. If the user selects one of these items a new page is
created in the workbench with the given perspective.
The visible perspectives within the menu may also be updated dynamically to
reflect user preference.
The input for the page is determined by the value of pageInput.
The input should be passed into the constructor of this class or set using
the setPageInput method.
This class may be instantiated; it is not intended to be subclassed.
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