MessageBox blocking processing of DrawText

Good afternoon

Ive coded a cbot that identifies patterns on a chart and identifies them with letters.  These letters are added to the chart using the DrawText command.  Once A, B and C points appear on the chart I use a MessagBox to ask the user if they want to place an order.  A and B appear on the chart when I expect them to. The DrawText for point C appears to be blocked by the call to (modal) MessageBox (even though the DrawText (C) fires before MessageBox).  Once MessageBox is closed/acknowledged by the user the point C appears.  I've created a dummy exhibiting the same behaviour below.  Is there any way to force the system to process the DrawText before the MessageBox - as it would really help the user make the decision of whether to place the order if they could see all three points A, B & C? Or do I need to create a new thread (would stretch my programing skills, unless you can spell it out for me!).

Many thanks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using System.Windows.Forms;
using System.Windows;
using System.Media;



namespace cAlgo.Robots
{
    [Robot(AccessRights = AccessRights.FullAccess)]
    public class MyTest : Robot
    {

        protected override void OnStart()
        {
            var text = Chart.DrawText("Text1", "Hello World", Bars.OpenTimes.LastValue, Bars.HighPrices.LastValue, Color.Red);
            MessageBox.Show("DrawText code not processed until after this MessageBox closes", "test", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }
    }
}