I'm not sure how to set the properties on the Ajax Control Toolkit controls using the CDN (not including the library in the project). I'm using the modal popup extender and I'm not sure how to set the properties like the TargetCotrolID since I don't have the Modal Popup Expender on the page. Do I have to set a reference or something to pull it in to the page or is are there additional things I need to do like register the assembly at the top of the page?
This is how I did it before I used the CDN:
<ajax:ModalPopupExtender ID="ModalPopupExtender" runat="server" TargetControlID="btnHidden"
BehaviorID="MPBehavior1" PopupControlID="pnlModalPopUp" ></ajax:ModalPopupExtender><asp:Button ID="btnHidden" runat="server" Text="Button" style="display: none;" />