title: WPF Datagrid horizontal scrolling with only header data
body: <p>I have a <code>WPF</code> <code>Datagrid</code>, at initial stage i will assign 100 column header to <code>Datagrid</code>, but I am not able to horizontal scroll it to view all column headers.</p>
  
  <p><code>DataGrid</code> does not have any rows, <code>ItemSource</code> is null. How do I achieve horizontal scrolling when I have only column headers (no rows).</p>
  
  <p>I binded <code>ItemSource</code> to a DataTable which has only column header and no rows.</p>
  
  <p>How can I scroll in this scenario. </p>