Flex Builder: I want to go from titleWindow to a panel.

Question

I'm building a user login page and I want to go from titleWindow to Panel. I'm using the following function but it always takes me back to parentApplication.

My question is how can I go to my panel and not to Application page?

I know that I'm using parentApplication but what should I use instead?

Here is a part of my code:

private function handleLogin(event:ResultEvent):void {
            Alert.show("You have succesfully logged in.", "Information", Alert.OK, null, null, null, Alert.OK);   

            parentApplication.accountPage.mainService.getAccount();                          
            PopUpManager.removePopUp(this);
        }