There are different rules related to the action required to activate a wand:
The wand section from magic items states (emphasis mine):
Wands use the spell trigger activation method, so casting a spell from a wand is usually a standard action that doesn’t provoke attacks of opportunity. (If the spell being cast, however, has a longer casting time than 1 standard action, it takes that long to cast the spell from a wand.)
Further, from the spell trigger section from the magic item section:
Activating a spell trigger item is a standard action and does not provoke attacks of opportunity.
And finally, checking the Rules Compendium, the Spell trigger section states (emphasis mine)
Activating a spell trigger item takes the same amount of time as the casting time of the spell that the item stores, but activating the item doesn’t provoke attacks of opportunity.
From these rules together I am having trouble understanding how a wand with a swift action spell would activate. Which action would be required for such a wand?