I have taken a code-behind aspx example and succeeded in splitting it into 3 files:
test.aspx, buslayer.vb, datalayer.vb in that the application still runs fine, but now I want to edit the aspx file. I get an error upon trying to edit the aspx page in VS. This page inherits from a class that does not support a design page.

My aspx directive is:
%@ page src=buslayer.vb inherits=buslayer.paging autowireevents=true%

buslayer.paging inherits page from system.web.UI

Any ideas?