title: Datagrid with filter row
body: <p>I am looking for some datagrid for my wpf application.</p>
  
  <p>I already used devexpress. I am not so happy with the devexpress control.
  So i wonna use now a free control. Do somebody know a free control.</p>
  
  <p>Where you have a datagrid , that have on top a filter row.
  Does somebody some a site with multiple free wpf controls?</p>