Hi,

I've just made my first attempt at using the ClientAPI (on DNN 4.0.3), by following the Client Callback pdf doc ...

I get this error msg: "failed: 400 - Unable to cast object of type 'ASP.default_aspx' to type 'DotNetNuke.UI.Utilities.IClientAPICallbackEventHandler'. (dnn_ctr370_ModuleTest_ddlTest)"

Which to me looks like default.aspx is trying to handle the callback instead of my module trying to handle the callback

I did notice that the pdf doc starts with:

Step 1 - Implement the IClientAPICallbackEventHandler
Public Class WebForm1
Inherits System.Web.UI.Page : Implements IClientAPICallbackEventHandler

Why do the docs refer to a Form, when in DNN all modules consist of UserControls?

Thanks

JK

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