using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
 
 namespace TrackOverlayWithEsc  
 {  
     static class Program  
     {  
         /// <summary>  
         /// The main entry point for the application.  
         /// </summary>  
         [STAThread]  
         static void Main()  
         {  
             Application.EnableVisualStyles();  
             Application.SetCompatibleTextRenderingDefault(false);  
             Application.Run(new TestForm());  
         }  
     }  
 }  
 

using System;  
 using System.Collections.Generic;  
 using System.ComponentModel;  
 using System.Data;  
 using System.Drawing;  
 using System.Linq;  
 using System.Text;  
 using System.IO;  
 using System.Collections.ObjectModel;  
 using System.Windows.Forms;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.DesktopEdition;  
 
 namespace TrackOverlayWithEsc  
 {  
     public partial class TestForm : Form  
     {  
         private bool cancel;  
         public TestForm()  
         {  
             InitializeComponent();  
         }  
 
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             winformsMap1.TrackOverlay.TrackMode = TrackMode.Polygon;  
 
             winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             LoadBackgroundLayer();  
             winformsMap1.CurrentExtent = new RectangleShape(-90, 30, -40, -20);  
             winformsMap1.Refresh();  
         }  
 
         //Get the KeyDown event of the map to abort tracking according to the key pressed.  
         private void winformsMap1_KeyDown(object sender, KeyEventArgs e)  
         {  
             if (e.KeyCode == Keys.Escape)  
             {  
                 cancel = true;  
                 TrackOverlayTrackEnding();  
             }  
         }  
 
         private void TrackOverlayTrackEnding()  
         {  
             if (cancel)  
             {  
                 //Set TrackOverlay to write.  
                 winformsMap1.TrackOverlay.Lock.EnterWriteLock();  
                 try  
                 {  
                     int count = winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Count;  
                     if (count > 0)  
                     {  
                         //Remove the feature being currently tracked. The currently tracked feature has the key "InTrackingFeature".  
                         winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Remove("InTrackingFeature");  
                     }  
                 }  
                 finally  
                 {  
                     //Commit the changes.  
                     winformsMap1.TrackOverlay.Lock.ExitWriteLock();  
                 }  
 
                 //Call the function to exit from the tracking mode.  
                 cancel = false;  
                 if (winformsMap1.TrackOverlay.TrackMode == TrackMode.Polygon )  
                 {  
                     //Polygon needs to call MouseDoubleClick. Event that marks finishing tracking a Polygon.  
                     //Same thing for Line.  
                     winformsMap1.TrackOverlay.MouseDoubleClick(new InteractionArguments());  
                 }  
                 else  
                 {  
                     //All other shapes have their tracking finalized at MouseUp event.  
                     winformsMap1.TrackOverlay.MouseUp(new InteractionArguments());  
                 }  
 
                 winformsMap1.Refresh();  
             }  
         }  
 
         private void btnTrackPolygon_Click(object sender, EventArgs e)  
         {  
             winformsMap1.TrackOverlay.TrackMode = TrackMode.Polygon;  
         }  
 
         private void btnTrackCircle_Click(object sender, EventArgs e)  
         {  
             winformsMap1.TrackOverlay.TrackMode = TrackMode.Circle;  
         }  
 
 
         private void LoadBackgroundLayer()  
         {  
             winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);  
 
             ShapeFileFeatureLayer worldLayer = new ShapeFileFeatureLayer(@"..\..\Data\Countries02.shp");  
             worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Country1;  
             worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
 
             LayerOverlay staticOverlay = new LayerOverlay();  
             staticOverlay.Layers.Add("WorldLayer", worldLayer);  
             winformsMap1.Overlays.Add(staticOverlay);  
         }  
 
 
     }  
 }