Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Telerik.Windows.Controls.GridView.DataCellsPresenter', AncestorLevel='1''. BindingExpression:Path=Foreground; DataItem=null; target element is 'ContentControl' (Name='PART_ContentPresenter'); target property is 'Foreground' (type 'Brush'). Such errors are shown when loading data and using some of the newer themes (VisualStudio2019, Fluent, Crystal).