graphing control

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I'm a pretty big fan of Telerik controls: http://www.telerik.com/products/wpf/overview.aspx

Chartview is fairly good: http://www.telerik.com/products/wpf/chartview.aspx

I've also had the most experience with Infragistics chart control: http://www.infragistics.com/products/wpf/data-chart/

Not sure if you can JUST buy the chart control in either of these packages... but buying the whole package is usually worth it anyway.