Thanks.  Was handling XamDataGrid.PreviewMouseDoubleClick event and setting e.Handled = true preventing auto resize.

You don't need to activate it. If you've upgraded your projects to 2009.2 or later version it should be available for you. Double-clicking the field's splitter either in the header, or in cells should autosize it. 

Regards.

Thanks.  How do we activate this behavior?

Hi Knji,

Yes, AutoSizing feature is available since NetAdvantage 2009.2 release.

Has this feature been implemented?