Allow With Enum, and With Class that has some shared members

I have a class named MyFlag with some static methods (and other non-static methods). Suppose I am using this code:
```VB.NET
Dim flag = MyFlag.X
flag += MyFlag.Y
flag = flag Xor MyFlag.Z
```

I tried to do this:
```VB.NET
With MyFlag
Dim flag =.X
flag +=.Y
flag = flag Xor .Z
End With
```

But got the error:
> 'MyFlag' is a class type and cannot be used as an expression.

So, I suggest to allow using classes that have some Static members in `With` block. This should also include enums.