Load preferences according to application mode
<p>I would like to load XML preferences according to application mode, like DEBUG, TEST or PRODUCION where different values are entered for the same keys.</p>

<p>Additionally the preferences default values must be set on start up.</p>

<p>This will allow easy testing in different circumstances.</p>

<p>Which is the best way to accomplish this.</p>

<p>PS: I don't want the user to see or have the option to change this settings. </p>
