WebBrowser in extra Thread dont Downloadcomplete Event

Hello,

I have the following problem:

The downloadcomplete event is not loaded in the sub.

Unless I insert a Messagebox.Show as a test. Then the downloadcomplete event is triggered. I do not understand the problem.

Button calls thread with:

Code:

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Dim ThreadX As New Thread(AddressOf MTX)
ThreadX.SetApartmentState(ApartmentState.STA)
ThreadX.Start()

---

The web browser element is created in a new thread: (Works with Messagebox "MessageBox.Show("OK1")". Without dont work)

Code:

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    Sub MTX()
        Dim WB1 As New WebBrowser
        WB1.ScriptErrorsSuppressed = True
        WB1.Navigate(New Uri("https://google.at"))

Reload:
        MessageBox.Show("OK1")
        If WB1.ReadyState = WebBrowserReadyState.Complete Then
            MessageBox.Show("LOADED")
        Else
            Thread.Sleep(500)
            GoTo Reload
        End If

    End Sub

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I have also tried it with a Do While Loop, without success

Any ideas? i Search since 2 days over 10 hours :o