How to change DatagridColumnHeader background when clicked ?

The headers are just buttons. Like any button, you can register to the Click event to capture those clicks. Just set a style targeting DataGridColumnHeader and add a Click event handler. Then within the handler, you have access to the header directly via the sender. You could then get the Column associated with that header and other information associated with it. Then in the code: private void columnHeader_Click(object sender, RoutedEventArgs e) { var columnHeader = sender as DataGridColumnHeader; if (columnHeader != null) { // Set background color here using columnHeader. } }