WPF DataGrid sample: Add a preview ToolTip to a ScrollViewer

A customer was asking for a sample of a preview ToolTip on scrolling for the DataGrid and Ben Carter, one of our awesome Devs, wrote a sample here for any general ItemsControl.  If you haven’t already, you can download the binaries and source for the DataGrid here. With Ben’s sample I’ve put it to use in the DataGrid. …

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