// class
DateTimeView.prototype = {}

var ui = MindFusion.UI;

var calendar = new ui.Calendar(document.querySelector("#cal"));
calendar.theme = "gray";
calendar.viewChanged.addEventListener(handleViewChanged);
calendar.render();

function handleViewChanged(sender, args)
{
    var dayView = new ui.DayView();

    //if the view has been changed to DayView
    if ( typeof args.newItem == typeof dayView )
    {
        //do something
    } 
}