public void DeleteEdge(NodeEditorEdge edge)
 {
     _edges.Remove(edge);
 }
 public void DeleteEdge(NodeEditorEdge edge)
 {
     _edges.Remove(edge);
 }
 protected void AddEdge(NodeEditorEdge edge)
 {
     _edges.Add(edge);
 }
 protected void AddEdge(NodeEditorEdge edge)
 {
     _edges.Add(edge);
 }