Dundas Chart in User Control

Question

Hi, I have a dundas chart with ajax zooming and scrolling enable. It works fine in a webform page. But once I put in a user control and called it from another page I get this error -

the target 'ctl00$ContentPlaceHolder1$uc2$chartVisits' for the callback could not be found or did not implement ICallbackEventHandler.

-when I try to use the zoom and scroll functionality.

What can I do to resolve this problem. Thank You.