window.onload = function () {
        var spread1 = document.getElementById("<%=FpSpread1.ClientID %>");
        if (document.all) {
            // IE
            if (spread1.addEventListener) {
                // IE9
                spread1.addEventListener("MenuItemClicked", mclick, false);                
            } else {
                // Other versions of IE and IE9 quirks mode (no doctype set)
                spread1.onMenuItemClicked = mclick;                
            }
        } else {
            // Firefox
            spread1.addEventListener("MenuItemClicked", mclick, false);          
        }
    }

function mclick() {
        var item = event.SelectedItem;
        if (item != undefined) {
            alert(item.innerHTML);
        }
  }