Calling a function in main mxml file from a component

I have a main mxml file for an application.
Within that file I have a viewStack with 3 components which
are in separate mxml files.
I have a function written in Action Script in the main
application that I want to call from the 3 components.
How is this done?
Ta
Mike

Thanks for the help. I got it working using ntsiii's method
(which is more straight forward but maybe not good practice?)
though the line
private var _appMain:Application = Application.application
gave me the error message:
1118: Implicit coercion of a value with static type Object to
a possibly unrelated type mx.core:Application.
So i changed it to:
private var _appMain:* = Application.application
Which made it work, I don't really understand why.
Thanks
Mike

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