title: Adding CheckBox to all columns in radgrid Header
body: <p>How to add checkbox to all the header columns (Like in the image) and get the checked value, here autogeneratecolumns is true. Pls suggest programmatically or Clientside. I tried telerik demos but not much of help from there. 
  <a href="https://i.stack.imgur.com/wHlE2.png" rel="nofollow noreferrer">enter image description here</a>
  Correction in Img: For all the columns, Including Article Type. </p>