Javascript runtime error when loading radalert/radconfirm

[Brad]

Hi all,

I am using the below code to try to display a radalert or confirm server-side and am getting this error:
1.)Microsoft JScript runtime error: '_visibilityMode' is null or not an object
2.) Microsoft JScript runtime error: Object doesn't support this property or method

Code:

ScriptManager

 

.RegisterStartupScript(this, this.GetType(), "WindowOpen", "radalert('Test', null, null, 'Test')", true);

 

 

 
I get the same problem if the code is in a Javascript function and that function is called.
ie.

 

function

 

openNewWindow()

 

{

 

var windowURL = "www.yahoo.com";

 

 

var oWnd = radopen("http://" + windowURL, null);

 

oWnd.center();

 

//var websiteName = getWebsiteName(oWnd.get_navigateUrl());

 

 

 

 

 

//Add new tab to the tabstrip

 

 

 

 

tabStrip.trackChanges();

 

var tab = new Telerik.Web.UI.RadTab();

 

tab.set_text(

"Test");

 

tabStrip.get_tabs().add(tab);

tab.set_imageUrl(oWnd.get_navigateUrl() +

"/favicon.ico");

 

tabStrip.commitChanges();

 

//Select this tab

 

 

 

 

tab.select();

}

 

the code is breaking on: var oWnd = radopen("http://" + windowURL, null);

Any ideas?

Thanks!

[Brad]

Figured it out.

I had the window manager on one of my User Controls that were sub a main page. Putting the Telerik script manager on the master page, and the window manager on the parent page of the user controls resolved the issue.