title: Hide/ show 'Add new record' in telerik:RadGrid
body: <p>So i have page contain telerik:RadGrid on top of the grid there Add new button i want when the user not allow to add new record to put visible =false 
  else visible =true i want to do it in code behind</p>
  
  <p><img src="https://i.stack.imgur.com/GWJTQ.png" alt=""></p>
  
  <p>All I can find on net is how to disable the button, and this not what I want I want -  to hide/show it depend on user                                                                                                                 </p>