'Telerik.Web.UI.RadListBox' is null or not an object

2 posts, 0 answers
  1. Juan Carlos Juarez
    Juan Carlos Juarez avatar
    7 posts
    Member since:
    Apr 2009

    Posted 23 Mar 2011 Link to this post

    Hi, I get the error 'Telerik.Web.UI.RadListBox' is null or not an object when I have a RadListbox present on my .ascx control firstable with visible as false, but when I try to show this control, this error occurs. It is not exclusive for this control on my sharepoint application, I have the same error with others Telerik controls that have the same behavior ( starting are hide, and then I need to show them).

    I followed this post, but I'm sure that all the entries and configurations are done on my application config. The version of telerik that I'm using is the 2010.3.1109.35


  2. Kalina
    Kalina avatar
    918 posts

    Posted 29 Mar 2011 Link to this post

    Hi Juan Carlos Juarez,

    Let me suggest you add the script references for RadListBox control and the other controls that you use manually through the ScriptManager  - as described in this help article.
    I hope this helps.

    All the best,
    the Telerik team
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