Drawing a line in a EditorWIndow?

Hi,

I need to draw a line between two points in an Editor window. I have found this answer but it is not working for me: http://answers.unity3d.com/questions/428599/how-to-make-a-line-between-object-in-editor-window.html

Does Handles.DrawLine just works inside an OnSceneGUI method? I have tried this too without any luck.

I would like to draw a line inside OnGUI if it is possible.

The code:

 using UnityEngine;
 using UnityEditor;
 using System.Collections.Generic;
 
     public class NodeWindow : EditorWindow
     {
         const int kPadding = 10;
 
         List<INode> _nodes = new List<INode>();
 
         INode _currentNode = null;
 
         [MenuItem("ComboMaker/Node window")]
         static void Create()
         {
             // Get existing open window or if none, make a new one:
             NodeWindow window = (NodeWindow)EditorWindow.GetWindow(typeof(NodeWindow));
             window.Show();
         }
 
         public NodeWindow()
         {
 
         }
 
         public void OnGUI()
         {
              Handles.BeginGUI();
              Handles.color = Color.red;
              Handles.DrawLine(new Vector3(0, 0), new Vector3(300, 300));
              Handles.EndGUI();
         }
 }
 
 
 

Cheers.