on Nov 29, 2012
Hi, I have exactly the same problem as Marlou.
I've tried a few hours to find a solution for the problem - but wasn't successful.
@Steve, is your advice then, to do it in code behind instead of the Designer?
PS: I am using Q3 2012 and VS2012 .net 4.5
EDIT: Finally I found the problem:
EF 5.0 is generating a DBContext instead of an ObjectContext per default, which was new to me.