Use + for multicast delegates

I have this delegate:
```Delegate Sub MsgSub(ByVal Msg As String)```

suppose I have two subs Show1 and show2, then I can do:
```
Dim M As MsgSub = [Delegate].Combine(New MsgSub(AddressOf Show1),
New MsgSub(AddressOf Show2))
```

In C# this can be done by using + operator directly, so why can't VB.NET allow this:

```
Dim M As MsgSub = New MsgSub(AddressOf Show1)+ New MsgSub(AddressOf Show2)
```

Furthermore, I want to do this directly:
```
Dim M As MsgSub = AddressOf Show1 + AddressOf Show2
```