[flexcoders] ambiguous reference error

[[p e r c e p t i c o n]]

Hi flex coders
i'm getting a strange error when i refer to a bound variable like thus...

<mx:Button x="504" y="511" id="submitButton" label="Continue"
click="Submit();" enabled="{valid}"/>

This is the mxml inside my mxml component and the variable is declared in
the code behind for the component...any reasons why i'm getting an ambiguous
reference error?
I even tried to refer to it this way -- com.xyz.valid

any help appreciated

percy klaasch