title: Getting row index from an ImageButton click in a GridView
body: <p>I have a Gridview with ImageButtons added to a column via a templatefield.  I've attached a function to the "OnClick" event.</p>
  
  <p>Once in this function, how can I get the index of the row that has the button that has been clicked.  It appears that all I have is the mouse coordinates on the page.</p>