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Expand the action view associated with this menu item. The menu item must have an action view set, as well as the showAsAction flag IMenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW. If a listener has been set using IMenuItem.SetOnActionExpandListener(IMenuItemOnActionExpandListener) it will have its IMenuItemOnActionExpandListener.OnMenuItemActionExpand(IMenuItem) method invoked. The listener may return false from this method to prevent expanding the action view.