Consegui!!
//camada actions
//botao 1
btn1.addEventListener(MouseEvent.CLICK, fl_ClickToGoToWebPage_1);
function fl_ClickToGoToWebPage_1(event:MouseEvent):void
{
navigateToURL(new URLRequest("https://google.com.br"), "_self");
}
//botao 2
btn2.addEventListener(MouseEvent.CLICK, fl_ClickToGoToWebPage_2);
function fl_ClickToGoToWebPage_2(event:MouseEvent):void
{
navigateToURL(new URLRequest("https://www.site.com.br"), "_self");
}
//botao 3
btn3.addEventListener(MouseEvent.CLICK, fl_ClickToGoToWebPage_3);
function fl_ClickToGoToWebPage_3(event:MouseEvent):void
{
navigateToURL(new URLRequest("https://www.adobe.com.br"), "_self");
}
//etc...