@Priya, thanks for your reply.
Yes I am sure that Auto-Generate Columns is set to true.
The problem, and also the big weirdness is that it was working but it is not working now.
When I use a datasource on my grid view the grids columns was automatically updated on design time. So I didn't have the write all those columns with hand. They were simply generated.
Let me explain it with a picture:
http://i30.tinypic.com/24lslkj.jpg[
^]
As you can see I have an Object Data Source with name odsUsers and a DataGrid using odsUsers as its data source. The columns are generated automatically.
After the "weirdness" I tried to add another grid to the same page with same properties using the same data source to assure that the problem is not with my new grids nor my new object data sources. As you can see the secon grid's columns are not generated.
This is really annoying.. X|