function GetRadWindow(winName) {

    var oManager = GetRadWindowManager();
    //Success. Getting existing window DialogWindow using GetWindowByName
    var oWnd =
(null == winName || "" == winName || "Cohort" == winName)
? oManager.GetWindowByName("Cohort")
: oManager.GetWindowByName(winName);
    return oWnd;
}