Filip,

>We've been subclassing third-party UI controls (Syncfusion) and, following Kevin McNeish's example (as seen in an msdn magazine article), let the subclassed components inherit from the MM binding and security interfaces.
>Upon dragging two CheckBoxAdv on the UI and building the following errors occur :
>
>Duplicate declaration of member 'ControlID'
>Duplicate declaration of member 'ControlID'
>
>and the two CheckBoxAdv disappear from the UI. They are still in the generated code though.
>We've tried, for each of the CheckBoxAdv, to generate a GUID, saving and building with the same result. Until now, the CheckBoxAdv and ComboBoxAdv are the only ones that we have had these problems with.

I'm not sure why you're getting this error...VS .NET has reportedly had issues with displaying this message when there really wasn't a problem. I recommend trying it on a new form to see if you still get the error. If you DO still get the error, I recommend looking closely at the code added to the form when you drop an instance of the control on it.

Regards,