ScriptUserControl, used as a base class in an MVP implementation that I'm working on, was removed by DevExpress from the toolkit. ScriptControlBase remains, but that inherits WebControl which doesn't jive when UserControl must be inherited/extended.
Has anyone brought in the new toolkit with this problem? How should I go about replacing ScriptUserControl?
I had exactly the same problem and had to maintain own AjaxControlToolkit version since rework would be too expensive.
Recently I convinced AjaxControlToolkit DevEx team to implement necessary changes and published missing AjaxControlToolkit.ScriptUserControl as a separate Nuget package. Try:
PM> Install-Package AjaxControlToolkit.ScriptUserControl