Declaration:

            MapPolyline drawingPolyLine;
            PathElement el;

Initialization:

xaml:

                <ig:MapLayer LayerName="drawLayer"  FillMode="None" Fill="Blue" Stroke="Red"  StrokeThickness="2">
                    <ig:MapLayer.Reader>
                        <ig:SqlShapeReader DataMapping="Data=polyline"  />
                    </ig:MapLayer.Reader>
                </ig:MapLayer>

code:

            drawingPolyLine = new MapPolyline();
            el = new PathElement();
            el.StrokeThickness = 10.0;
            el.Fill = new SolidColorBrush(Colors.Red);
            el.Polylines = new MapPolylineCollection();

Drawing:

 private void xamMap_MapMouseLeftButtonUp(object sender, MapMouseButtonEventArgs e)
        {
            if (this.DrawModeSelected)
            {
                    Point newPoint = e.Position;
                    Point geoPoint = getMapCoordinateByClickPoint(newPoint);               
                    if (drawingPolyLine.Count == 0)
                    {
                        drawingPolyLine.Add(geoPoint);
                    }
                    drawingPolyLine.Add(geoPoint);
                    el.Polylines.Clear();
                    el.Polylines.Add(drawingPolyLine);
                    xamMap.Layers["drawLayer"].Elements.Clear();
                    xamMap.Layers["drawLayer"].Elements.Add(el);
                    xamMap.UpdateLayout();

      }

private void xamMap_MapMouseMove(object sender, MapMouseEventArgs e)
        {
            if (this.DrawModeSelected)
            { 
                if (drawingPolyLine != null)
                {
                    if (drawingPolyLine.Count > 0)
                    {                       
                        Point newPoint = e.Position;
                        Point geoPoint = getMapCoordinateByClickPoint(newPoint);
                        drawingPolyLine[drawingPolyLine.Count - 1] = geoPoint;
                        el.Polylines.Clear();
                        el.Polylines.Add(drawingPolyLine);
                        xamMap.Layers["drawLayer"].Elements.Clear();
                        xamMap.Layers["drawLayer"].Elements.Add(el);
                        xamMap.Layers["drawLayer"].UpdateLayout();
                    }
                }               
            }
        }

My point is that when I move mouse over the map I want to see how the line is changing, but it is not happening.

Thanx a lot!