C#

<DockPanel x:Name="MainWindow">

        <Menu Name="dropDownMenu"
              DockPanel.Dock="Top">

            <MenuItem Name="dropDownPage1" Header="File">
                <MenuItem Header="Page1" Click="dropDown_Page1"/>
            </MenuItem>

            <MenuItem Name="dropDownPage2" Header="File">
                <MenuItem Header="Page2" Click="dropDown_Page2"/>
            </MenuItem>

        </Menu>
        
        <Grid Name="gridMainContent" DockPanel.Dock="Top">
            <TextBlock>placeholder main content</TextBlock>
        </Grid>
        
        <Grid Name="gridStatusBar" DockPanel.Dock="Bottom">
            <TextBlock>placeholder statusbar</TextBlock>
        </Grid>
    </DockPanel>

SerialPort sp = new SerialPort("COM1");

private void Form1_Load(object sender, EventArgs e)
{
    sp.NewLine = "\r\n";
    sp.Parity = Parity.None;
    sp.DataBits = 8;
    sp.StopBits = StopBits.One;
    sp.DtrEnable = true;
    sp.WriteBufferSize = 1024;

    sp.Open();
    sp.WriteLine("ATE0");
    sp.BaseStream.Flush();
    sp.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(sp_DataReceived);
}

void sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    string str;
    str = sp.ReadLine();
    if (str == "RING")
    {
        sp.WriteLine("ATA");
        sp.BaseStream.Flush();
    }
    System.IO.File.AppendAllText("c:\\log_receiver.txt", str + "\r\n");
}

private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
    sp.Close();
}

SerialPort sp = new SerialPort("COM8");

private void Form1_Load(object sender, EventArgs e)
{
    sp.NewLine = "\r\n";
    sp.Parity = Parity.None;
    sp.DataBits = 8;
    sp.StopBits = StopBits.One;
    sp.DtrEnable = true;
    sp.WriteBufferSize = 1024;

    sp.Open();
    sp.WriteLine("ATE0");
    sp.WriteLine("ATDT6632");
    sp.BaseStream.Flush();
    sp.WriteLine("My string to be sent");
    sp.BaseStream.Flush();
    sp.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(sp_DataReceived);
}

void sp_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    string str;
    str = sp.ReadLine();
    File.AppendAllText("C:\\log_sender.txt", str + "\r\n");
}

private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
    sp.Close();
}

private void timer_Elapsed(object state)
{
    if (Dispatcher.CurrentDispatcher != _dispatcher) 
// _dispatcher is a reference to the Dispatcher under wich the Timer was instantated
    {
        _dispatcher.Invoke(
        new System.Threading.ThreadStart(delegate
        {
            onTick();
        }), DispatcherPriority.Send); 
    }
    else
    {
        onTick();
    }
}

private void onTick()
{
    if (Tick != null)
    {
        Tick(this, new EventArgs());
    }
}

private Point PositionNodes(List<Node> nodes, Point point)
      {
         // Create new start point for downwards line
         Point newStartPoint = new Point();
         Point newFinishPoint = new Point();
         newStartPoint = point;

         int nodeHeight = nodes[0].Size.Height;

         // Loop nodes
         for(int i = 0; i < nodes.Count; i++)
         {
            // Set node location and draw
            nodes[i].Location = point;

            // Increase Y by one line
            point.Y += nodeHeight;

            // If node has child nodes
            if (nodes[i].Nodes.Count > 0 && nodes[i].Expanded)
            {
               // Call method again on child nodes
               point.Y = PositionNodes(nodes[i].Nodes, new Point(point.X + m_xIndentation, point.Y)).Y;
            }

            // Set finishing point of line
            newFinishPoint = point;
            newFinishPoint.Y -= (int)(nodes[0].Size.Height * 0.5);

            // If node has only one child and is expanded reduce line by this amount
            if (nodes.Count == 1 && nodes[i].Expanded)
            {
               // Reduce line by child nodes amount
               newFinishPoint.Y -= AmountToDeduct(nodes[i].Nodes);
            }

            // Add points to list
            m_linePoints.Add(newStartPoint);
            m_linePoints.Add(newFinishPoint);
         }

         // Cumulative height of nodes
         return point;
      }