How to set properties in aspx file in user controls wrapped in a with WebLibraryMaker

Feb 17 at 6:07 PM
I have just added a new thread in Custom Server Controls fórum.
Could you please give me some feedback?

Here is the link:
https://forums.asp.net/p/2115908/6117722.aspx?p=True&t=636229261622102460
Feb 17 at 7:01 PM
For more information:
I have tried adding a Base class (inheriting from System.Web.UI.UserControl) which exposes a very simple Property and from which my user control also inherits.
System.Web.UI.UserControl > Base class > My User control class.
When I tried to set this property via de .aspx designer, same exception occurs, but this time mentioning base class type.