Hello Richard,
There is nothing special in the ajaxification of a RadHtmlChart control. This is done like any other script control - you can use
RadAjaxManager,
RadAjaxPanel or a standard asp UpdatePanel. For example:
ASPX:
Note that a scenario in which you try to ajaxify telerik controls which are positioned within a user controls works differently than a scenario when controls are loaded directly on a web form. Therefore you need to create the RadAjaxManager control to the web part class and add it to the Controls collection of the web part itself.
More information as well as an example on how to do that is available in
telerik ajax issue with sharepoint 2010 forum thread. You can also find useful
Create an AJAX-enabled SharePoint WebPart that uses RadControls help article which gives more information on the topic.
Regards,
Danail Vasilev
Telerik
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