“For each” skips elements when previous element is disposed

Not sure it is related to vblang.
Please consider the following

```
For each joy in MetroPanelSinottico.Controls
If TypeOf (joy) Is myJOYlib.myJOYlib Then
joy.dispose()
End If
Next
```

Disposing an element in a collection causes the collection to shrink by one element. Supposing a collection of n controls, and I remove the i-th element, the next control is the (i+1)th element of the (n-1)-elements collection, which is actually the (i+2)th element of the collection having n elements. The workaround is this:

```
For joy = MetroPanelSinottico.Controls.Count - 1 To 0 Step -1
If TypeOf (MetroPanelSinottico.Controls(joy)) Is myJOYlib.myJOYlib Then
MetroPanelSinottico.Controls(joy).Dispose()
End If
Next
```

Now: if I write "for each" I mean each of the elements in the collection, disregarding their actual index.
Is the present behaviour expected, or is this an unwanted side effect or am I asking too much?