Private Sub NotifyIcon1_MouseDown(ByVal sender As Object, ByVal e As _
      System.Windows.Forms.MouseEventArgs) Handles NotifyIcon1.MouseDown
        ' Form anzeigen, falls sie minimiert ist: 
        If WindowState = FormWindowState.Minimized And _
            e.Button = Windows.Forms.MouseButtons.Left Then
            WindowState = FormWindowState.Normal
            ShowInTaskbar = True
        End If
    End Sub