<script language="javascript" type="text/javascript"> 
    window.onload = function () { 
      var spread1 = document.getElementById("<%=FpSpread1.ClientID %>");
      if (document.all) {
      // IE
      if (spread1.addEventListener) {
      // IE9
      spread1.addEventListener("SelectionChanged", selectChanged, false);
      } else {
      // Other versions of IE and IE9 quirks mode (no doctype set)
        spread1.onSelectionChanged = selectChanged; 
      }
      else {
      // Firefox
      spread1.addEventListener("SelectionChanged", selectChanged, false);
      } 
    } 
    
    function selectChanged() { 
      alert("You have changed selections!"); 
    }
</SCRIPT>