Switching views causing "Sys.ArgumentNullException: Value cannot be null" javascript error

[Venkatesh]

Hi,
I am using the RadAjaxManager and RadGrid,
In the page, i have a button, on clicking it, i am changing the view as below:

CustomMultiView.ActiveViewIndex = 1;

I am getting the below javascript error:

Message: Sys.ArgumentNullException: Value cannot be null.
Parameter name: panelsCreated[3]
Line: 129
Char: 12
Code: 0
URI: server/ScriptResource.axd?d=RPebyLkP-fhDCOP8R5TjxWPY-4fkPjRpQKETtPt1vJ0oYKjzG0P1oXDrWwqGUYowJk6FNzcl9JDcrVPqxhlevrLUyg2lficlL2Y9_KKnDvF49irZMVbCoI5gJzWm8v_Unf6FfAqjKOclBxnSZZAf9ybMAzMisFKw_edGwuOokTcB0Hr10&t=ffffffffb868b5f4

I am using Sharepoint 2010. I have seen the below url:
http://www.telerik.com/community/forums/sharepoint-2010/integrate-ajax-controls/telerik-ajax-issue-with-sharepoint-2010.aspx

However the changes provided in the url have not helped. How to fix this?
Thanks

[Marin]

Hi,

 The ajaxifying of the controls in this case should be done in the code behind of the web part as shown below. All ajax settings should be added in the code-behind:

public class VisualWebPart1 : WebPart
    {
        // Visual Studio might automatically update this path when you change the Visual Web Part project item.
        private const string _ascxPath = @"~/_CONTROLTEMPLATES/VisualWebPartProject1/VisualWebPart1/VisualWebPart1UserControl.ascx";
        RadAjaxManager ajaxmgr;

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            ajaxmgr = RadAjaxManager.GetCurrent(Page);
            if (ajaxmgr == null)
            {
                ajaxmgr = new RadAjaxManager();
                Page.Items.Add(typeof(RadAjaxManager), ajaxmgr);
            }

            if (Page.Form != null)
            {
                Page.Form.Controls.AddAt(0, ajaxmgr);
            }
            EnsureChildControls();
        }

        protected override void CreateChildControls()
        {
            Control control = Page.LoadControl(_ascxPath);
            Controls.Add(control);

            MultiView multiView = control.FindControl("CustomMultiView") as MultiView;

            //Find more controls to add to the ajax settings
            if (ajaxmgr != null)
            {
                AjaxSetting ajaxSetting = new AjaxSetting();

                ajaxSetting.AjaxControlID = multiView.ID;
                ajaxSetting.UpdatedControls.Add(new AjaxUpdatedControl(multiView.ID, string.Empty));

                ajaxmgr.AjaxSettings.Add(ajaxSetting);
            }
        }
    }

Greetings,
Marin
the Telerik team