title: How can I create a second row of headers with TextBoxes on it on my DataGrid?
body: <p>I have created a DataGrid and now want a second row of headers in the TextBoxes. I want it to look like this in the end. There are already similar examples on the site but they couldn't help me. I would be very grateful if someone could give me a Xaml code to implement it as shown in the example.</p>
  <p><a href="https://i.stack.imgur.com/fwq6P.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fwq6P.png" alt="Example" /></a></p>