// add zone circle
public void AddCircleZone(double areaRadius, PointLatLng center)
{
//remove if exists
try
{
RemoveCircleZone(center);
}
catch
{
}
if (chkShowRadius.IsChecked == true)
{
GMapMarker it = new GMapMarker(center);
it.ZIndex = -1;
Circle c = new Circle();
c.Center = center;
c.Bound = center.createPointLatLngFromCenterMiles(areaRadius);
c.Tag = it;
c.IsHitTestVisible = false;
UpdateCircle(c);
Circles.Add(it);
it.Shape = c;
MainMap.Markers.Add(it);
}
}