I am doing some hit testing for some custom drag and drop code.  However, my code is interfering with the autofilter control itself.  Is there a way to detect if a auto filter popup is currently being displayed?  If I can detect this then I can route temporarily disable my code while its in effect.    

The auto-filter drop down will appear when distinct values are calculated for a data-grid item property. That said, you can set the DefaultCalculateDistinctValues property of the DataGridCollectionViewSource to false (by defaul true)  and explicitly set the CalculateDistinctValues property of each data-grid item property for which you want ...