public override void DrawInContext(MonoTouch.CoreGraphics.CGContext ctx)
{
base.DrawInContext (ctx);
float radius = Math.Min(this.Bounds.Width, this.Bounds.Height)/2;
PointF center = new PointF (this.Bounds.Width / 2, this.Bounds.Height / 2);
//Background Circle
ctx.AddEllipseInRect(new RectangleF(center.X,center.Y, radius *2, radius *2));
ctx.SetFillColor(TrackColor.CGColor);
ctx.FillPath();
// Elapsed Arc
ctx.AddArc(center.X,center.Y,radius, StartAngle, (float)(StartAngle + Progress * 2.0f * Math.PI),false);
ctx.AddLineToPoint(center.X,center.Y);
ctx.ClosePath();
ctx.SetFillColor(TintColor.CGColor);
ctx.FillPath();
}
