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RadAjaxManager and RadPanelBar inside RadGrid not working.
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Harish asked on 16 Jul 2015, 02:44 AM

Hi All,

I am using RadAjaxManager, RadPanelBar andRadGrid in my user control.


1. Click on Webpart and click on "Add new record" in Grid from "FirstTabl" tab at first without clicking on any tab.
    Add Mode and Edit Mode working fine as expected. Showing and populating all control(RadEditor, RadPanel etc.) from the grid properly.
    It works fine.

2. Click on Webpart and then click on any other tab, then click on click on "Add new record". from Grid
    Add Mode and Edit Mode behaves weird. Data not getting populating properly.

Controls inside RadGrid and AjaxManager not initializing properly.
Error: 0x800a138f - JavaScript runtime error: Unable to get property '_preInitialize' of undefined or null reference

After follow the #1 step and then if you work with any Tab its working fine.

Can anyone please help me how resolve this issue ? Why this is happing with TAB and Grid with Ajaxmanager.


Harish Patil

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Viktor Tachev
Telerik team
answered on 20 Jul 2015, 11:53 AM
Hi Harish,

Based on the provided information it would be hard to pinpoint the exact cause of the issue.

Nevertheless, try to disable AJAX on the page by setting the EnableAJAX property of RadAjaxManager to false and see if there is a server-side error thrown.

Also, please share the markup of the page with the related code-behind. Thus, anyone that is willing to help can examine the code and suggest what can cause the problematic behavior.

Viktor Tachev
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