Hello Hans,
Note that ajaxifying the telerik controls that are positioned within a user controls works somewhat differently from the scenario when they are loaded directly on a web form. In you case, you need to use RadAjaxManager control placed in the web part class instead of RadAjaxPanel. Create the manager there and add it to the Controls collection of the web part as follows:
Then in the OnLoad event of the web part, get the RadAjaxManager as follows:
and add your ajax settings programmatically. Beforehand, you should have the user control in the CreateChildControls method of the web part and there through FindControl you should retrieve the controls to ajaxify. Keep them in a private variable local to the web part class and use that in the OnLoad event to dynamically add the ajax settings.
Hope this information will prove helpful.
Regards,
Maria Ilieva
Telerik
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