.Net 4.0 UpdatePanel, dropdown

[Greg]

We have an update panel that should be populating a radcombobox based on the selected value from a lookup screen.

This worked prior to .net 4.0. When we select the lookup in .net 4.0, the following error occurs in what looks to be a Telerik script on the below line of code. This also completely disables the radcombobox after the error!

Microsoft JScript runtime Error: Object doesn't support this property or method.

if

(this._disposeChildElements&&typeof(Sys.WebForms)!="undefined"){Sys.WebForms.PageRequestManager.getInstance()._destroyTree(c)

I believe this is in Telerik.Web.UI.dll and core.js.

I have downloaded telerik version 2010.3.1215.0. Once this is installed, what do I need to do to ensure the Bin40 version is used?

Telerik.Web.UI.dll exists in both Bin35 and Bin40.
Seems that there is an issue with the way the 4.0 UpdatePanel is interacting with the Telerik drop down.

How to resolve this?

 

 

 

 

 

 

 

 

 

[Greg]

This has been resolved by patching to latest version, updating web.config, and readding the references to the dlls in web\bin.