I had to allow selection from DropDownList in edit mode of DetailsView control instead of the default TextBox so I used this example : http://blogs.msdn.com/robburke/archive/2006/03/09/547082.aspx
It works good. but the only thing that I don't undertand is that in the html tab I don't see the SelectedValue property in the DropDownList properties intelliSense. But if I write it manually it works good : SelectedValue= '<%# Bind("State")%>'.
My question is why the SelectedValue doesn't apear in the DropDownList intelliSense. Is that a bug of the Visual Studio ?