config.xml

[EltonSilva]

how can I manipulate the config.xml?

[Drew]

how can I manipulate the config.xml?

You might need to be a little more descriptive in your question.
But if you want to edit config.xml just open it up in something like Notepad, Notepad++, Textpad...

Also.. this is a Flex API forum, if you are referring to the Flex Viewer check out the Flex Viewer forum
http://forums.arcgis.com/forums/111-ArcGIS-Viewer-for-Flex