title: MahApps DataGrid column header casing
body: <p>I'm using the excellent MahApps library to style my WPF app and have integrated a DataGrid to display rows from a database. MahApps' default styling of the DataGrid displays the column headers in upper-case, but in my case I need to keep the original casing of the columns.</p>
  
  <p>Now I'm not an expert in WPF and even less in WPF styling, so I was wondering whether there was an "easy" way to only reset the casing of the TextBlock used there, or if I had to re-define a complete DataGrid styling.</p>
  
  <p>Thanks in advance,
  Thomas</p>