To my second question - How to ''wire'' my custom FilterCriterion for given column. It looks that there is only one way - create own FilterEditor (I use simple TextBox), and return in dependency property FilterCriterion a customized myFilterCriterion object as FilterCriterion. Using this way I lost support for composed filtering ...

Is there a way to maintain the Autofilter settings when the datacontext of a grid is updated or refreshed?     Also is there any plans to include the filter settings in the SaveUserSettings method?