function ChangeLatticeMode() 
    {
    var modeDdl = document.getElementById("CalendarLatticeMode");
    var selectedOption = modeDdl.options[modeDdl.selectedIndex];
    var latticeValue = selectedOption.text;
    
    var slPlugin = document.getElementById("Xaml1"); //Silverlight plugin
    slPlugin.Content.SilverlightObject.SetCalendarLatticeMode(latticeValue);
}