Hello
A RadDatePicker placed in the content template of a RadWindow, that is placed inside of an update panel, cause javascript "Sys.InvalidOperationException: Two components with the same
id '' can't be added to the application." exception on postback.
To get it follow repro steps below.
Using Telerik.Web.UI.dll 2010.1.429.20 version.
Repro steps:
1) Create a Web Form
2) Use this code as the form source:
3) Open the form in a browser
4) Pick up a date
5)Observe javascript exception "Sys.InvalidOperationException: Two components with the same id 'radWindow_C_radDatePicker' can't be added to the application."
Please provide a workaround as soon as possible.