Dynamically adding a DayPilotMenu

I created this but it is not working:

DayPilotMenu menu = new DayPilotMenu();
menu.ID = "CustomMenu1";
MenuItem item = new MenuItem();
item.Text = "Edit...";
item.Action = MenuItemAction.NavigateUrl;
item.NavigateUrl = "test.aspx?id={{0}}";
item.NavigateUrlTarget = "_blank";
menu.MenuItems.Add(item);
DayPilotCalendar1.Controls.Add(menu);

It's possible to have several menu types and assign them to events in BeforeEventRender (e.ContextMenuClientName set to the value of DayPilotMenu.ClientObjectName).

But if you really need item-specific text you should use the bubble.

Ok i am using the Bubble but how do i get the Start and End from the event.

At this moment, only the event id (PK) is sent to the bubble RenderContent event. You should load other data from the DB.