How to close Dynamic generated window on button click of that window..

[Ganeshpatil]

Window win = new Window();
win.ID = "window1";
win.Width = Unit.Pixel(500);
win.Height = Unit.Pixel(380);
win.Modal = true;
win.Maximizable = true;
win.Loader = new ComponentLoader();
string str = ViewState["ReturnPage"].ToString();
win.Loader.Url = str + "?mode=1";
win.Loader.Mode = Ext.Net.LoadMode.Frame;
win.Render(this.Form);


please reply me.........