List xml files in Flash builder Open Resource

I use the Open 开发者_如何转开发Resource Window (Command-Shift-R) a lot in Flash Builder and it saves me a lot of time. But I can´t seem to get it to work with my projects xml files. I know this has been working on previous projects ut I can´t find any settings for this.

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I found the answer myself. The Open resource window did not show "derived files". Problem solved.