private Graphic AddVertexToEditLayer(Graphic graphic, GraphicsLayer layer, MapPoint p)
{
Graphic g = new Graphic()
{
Geometry = p,
Symbol = VertexSymbol
};
g.SetZIndex(2);
layer.Graphics.Add(g);
g.Attributes.Add("Feature", graphic);
g.AddDoubleClick(vertex_doubleClick);
return(g);
}
