Hi,
   Telerik ver: 2009 Q2 and asp.net 3.5
I have a web form which has a radajaxpanel and script manager. I load a different usercontrol dynamically based on user selection on this webform.

The usercontrol has a combobox which updates a rad grid in the user control. I also have a radajaxmanagerproxy on this page.
When item is changed in rad combobox, the grid updates, but loading panel is NOT fired.

I tried this in the uuercontrol:

 RadComboBox1.PreRender += new EventHandler(RadComboBox1_PreRender);  // in page load

 void RadComboBox1_PreRender(object sender, EventArgs e)
        {

            RadAjaxLoadingPanel ajaxLoadingPanel = (RadAjaxLoadingPanel)Parent.FindControl("RadAjaxLoadingPanel1");
            RadAjaxManager.GetCurrent(this.Page).AjaxSettings.AddAjaxSetting(RadComboBox1, RadGrid1, ajaxLoadingPanel);


        } 



Please advice.

Hello Sayak,

To implement your scenario you should dynamically add the AJAX settings for ajaxifying the UserControl. You should always do this in a Page event handler, which is executed each time during the page lifecycle (Page_Load, Page_PreRender) so that the control could be ajaxified when the page is initially loaded.

For more information on how this can be done, please take a look at the last section of the RadAjax and WebUserControls help topic.

All the best,
Pavlina
the Telerik team