private void AddNewVertice(SilverlightEdge edge1, SilverlightEdge edge2)
{
if (!Vertice.CheckIfVerticeExist(edge1.Edge, edge2.Edge))
{
SilverlightVertice vertice = new SilverlightVertice(edge1.Position, edge2.Position);
vertice.Line.MouseLeftButtonDown += new MouseButtonEventHandler(line_MouseLeftButtonDown);
edge1.Edge.AddVertice(new Vertice(edge2.Edge));
edge2.Edge.AddVertice(new Vertice(edge1.Edge));
this.LayoutRoot.Children.Add(vertice.Line);
}
}