Debug.Draw using EditorWindow

Hello,

I'm trying to draw some triangles in the scene view using Debug.Draw from a custom editor window.
Problem is, calling the Debug.Draw will draw A LOT, its like it is getting called more than once per scene frame.

Here is a part of the window code :

Code (CSharp):

1. public class MeshWindow : EditorWindow
2.             {
3.  
4.                 public void OnFocus()
5.                 {
6.                     SceneView.onSceneGUIDelegate += this.OnSceneGUI;
7.                 }
8.  
9.                 public void OnDestroy()
10.                 {
11.                     SceneView.onSceneGUIDelegate -= this.OnSceneGUI;
12.                 }
13.  
14.                 public void OnSceneGUI(SceneView sceneView)
15.                 {
16.                     if (_drawMesh)
17.                     {
18.                         _mesh.Draw();
19.                     }
20.                 }
21.             }

This draws the mesh, but it draws it a thousand times for each time the scene view gets rendered.

What would the solution to this be?

Thanks!