void g_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "Symbol")
{
Graphic g = sender as Graphic;
if (g.Geometry is Polygon || g.Geometry is Envelope)
JsonTextBoxFillCurrent.Text = (g.Symbol as IJsonSerializable).ToJson();
else if (g.Geometry is Polyline)
JsonTextBoxLineCurrent.Text = (g.Symbol as IJsonSerializable).ToJson();
else
JsonTextBoxMarkerCurrent.Text = (g.Symbol as IJsonSerializable).ToJson();
}
}