4.0: support for partial classes

I tried the following in the Demo App of the latest Beta for SE 4.0:

On the ".NET Language Reflection with external References" Demo Form, I wrote the following code on the first tabpage:

// BaseControl.cs
public partial class ARC
{
public int i;
}

I wrote the following code on the second tabpage:

// InheritedControl.cs
public partial class ARC
{
public void Test()
{
// try to invoke IntelliSense HERE
}
}

When I invoke IntelliSense on the second tabpage, I expected to see the "i" Member in the Member List.

Might this be a bug, or am I missing something ?

Kind Regards
Matthias