Styles and Templates in WPF DataGrid control | Syncfusion
xaml - Multilevel column header for DataGrid in WPF - Stack Overflow
GitHub - SyncfusionExamples/how-to-create-wpf-datagrid-with-multiple-header-rows: This example explains about how to create wpf datagrid with multiple header rows (stacked header rows).
Text wrapping in WPF DataGrid column header – marcelwouters