Page Book Component Error

Question

I keep getting the following error:
1046: Type was not found or was not a complie-time constant:
BookEvent
for the code below
private function onPageTorn (event:BookEvent):void {
if (myBook.pages.getItemIndex(tearablePage1) == -1){
tearBtnVisible = true;
Can anyone help me with this error.

Answer 1

Okay, based upon a sample method found (
http://www.rubenswieringa.com/code/as3/flex/Book/docs/)
Here is the BookEvent class, which did fix those previous
errors, but I do not know what or how to make this funciton
correct.
Sample function:
public function BookEvent():void{
if (type:String, book:PageManager, page:Page = null,
bubbles:Boolean = false,
cancelable:Boolean = false);
}