CalendarPanel1.EventStore maximum size

Good day
I have been strugling with the following problem
I Created a page of calendar, using calendarpanel1.
after geting my eventmodelcollection i add it to calendar panel events and there problem starts
if I trying to load more than 4118 events, no events shown at all

Code:

---

protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            EventModelCollection n = Store_Data();
            this.CalendarPanel1.EventStore.Events.AddRange(n);
            MonthPicker1.SelectedDate = DateTime.Now.Date;
        }
    }
...
 public EventModelCollection Store_Data(){
 EventModelCollection SQLEMC = new EventModelCollection();
      ...
      ...
return (SQLEMC);}

---

Store_Data(); manages to make all the events from SQL server, all 25619 events to be put in calendar
but page shows empty calendar with no events at all
as soon as i limit number of events in query to 4118, calendarpanel1 shows 4118 events.
if i put 4119 it doesnt show any
anything i need to do to fix this problem?

best possible would be to bring all 25thousands events.,.

waiting for reply
Thank you for your time