After closing the window when I try to perform any action the error occurs.
I'm using the service pack for Q2.
This post I had already checked and not helped me.
The code I'm using to open a new window:
RadWindow Consulta = new RadWindow();
Consulta.ID = "RadWindowManager1";
Consulta.NavigateUrl = "Tela.aspx";
Consulta.VisibleOnPageLoad = true;
Consulta.Width = 550;
Consulta.Height = 480;