Opened again by Stephen Walther on May 8, 2013
I have a usercontrol inside a panel, that I would like to display, but I keep on receiving : Microsoft JScript runtime error: Unable to get value of the property 'UI': object is null or undefined
VS2010
Latest Nu-get Ajax Toolkit
.net 4.0
Comments: I am also getting this error, and like Bill_H I have ScriptManagerProxy on my content pages as well as EXTENSIVE usage of global resources (which is specifically not supported by the toolkitScriptManager) because this is a internationalized application. So other than using the toolkitScriptManager I don't see another work around available.