Right-Click Context Menu

var menu:ContextMenu = new ContextMenu();
menu.hideBuiltInItems();
var menuItem:ContextMenuItem = new ContextMenuItem("Go to google");
menuItem.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, goToContextMenu); 
menu.customItems.push(menuItem);
this.contextMenu = menu;

function goToContextMenu(event:ContextMenuEvent):void {
   var link:URLRequest = new URLRequest("http://www.google.com");
   navigateToURL(link,"_blank");
}

Center A Display Object

centerObject(obj); //Centers a display object

function centerObject(obj:DisplayObject):void {
 obj.x = stage.stageWidth / 2 - obj.width / 2;
 obj.y = stage.stageHeight / 2 - obj.height / 2;
}