Let me go through what happened here. You created an instance business.Pages.Page, which means that the page class constructor is being called. Then you added the control to the collection Controls. Then you called the method RenderControl()on this page.
. OnInit, OnLoad .., - , ? HttpHandler, , , , , .
System.Web.UI.Page.ProcessRequest(), , , , .
, - , . new() , . RenderControl(), . , !