In Qtopia, when the context menu is opened we always want the first (non-disabled) action selected by default. To do this, we use setActiveAction(). However, if the first item is a submenu, the submenu will be automatically opened by the function call. The documentation gives no indication of this: "Sets the currently highlighted action to act."
If the behavior can't change, it would be nice if the documentation could be updated, and ideally an alternative method provided that only highlights the action (and doesn't trigger anything).