# Setting ClientIDMode to Static Breaks the Telerik Controls Functionality

## Environment

<table>
	<tbody>
		<tr>
			<td>Product</td>
			<td>Progress® Telerik® UI for ASP.NET AJAX</td>
		</tr>
	</tbody>
</table>

## Description

When working with Telerik UI for ASP.NET AJAX, setting the `ClientIDMode` property to `Static` breaks the functionality of the Telerik controls.

## Cause

Telerik AJAX controls do not support the `ClientIDMode=Static` mode.

## Solution

Microsoft recommends using `ClientIDMode="Static"` only for static controls. The Telerik controls, on the other hand, are controls with complex hierarchies of child controls and templates so setting their `ClientID` mode to static will break their functionality.

To solve this issue, use the `AutoID` mode for the Telerik controls on the page especially when they are performing AJAX requests.