title: Event for Select All: WPF Datagrid
body: <p>I am using WPF data-grid. In data-grid user have column-headers and row-headers.</p>
  
  <p>When column-headers and row-headers both of them are visible, in the top left corner we have one small square section available. (cross section in the top left corner where the column and row headers meet.) when we click on that it selects all the cells within data-grid. Is there any event for that? If not how can trap that event. Please guide me. </p>
  
  <p>Do let me know if you need any other information regarding this problem.</p>
  
  <p>Regards,
  Priyank</p>