Fullscreen functions

I’ve tried to set Application.RequestFullScreen()  but it won’t compile or run.

Is there a missing DLL or something?

I’ve used the example code for doing this:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles btnFullScreen.Click
‘Application.Call(“FullScreen”)
If Application.Browser.IsFullScreen Then
Debug.Print(“fullscreen”)
End If
End Sub

It blows up just checking the fullscreen state.

Thanks for any advice.  (a working demo would be greatly appreciated,  I use VB, but C# works 🙂 )