Column Auto-Sizing is not supported in version 2.0 of the DataGrid for WPF.

Support for Column Auto-Sizing is currently planned for version 2.1.

For more details on version 2.1, please refer to the roadmap, which can be found here:
http://xceed.com/CS/forums/thread/11207.aspx

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Marc Laroche
Software Developer
Xceed Software Inc.

I don’t suffer from insanity, I enjoy every minute of it. - Unknown