Question How to create a scale field?

I need to create a scale field with x, y and z values for creating Box Collider with these values. Here's a code:

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3. using System.Collections;
4. using System.Collections.Generic;
5.  
6. public class SampleWindow : EditorWindow
7. {
8.     bool Colliders;
9.  
10.     Vector2 scrollView = Vector2.zero;
11.  
12.     [MenuItem("Window/Other/Open Sample Window #M")]
13.     static void onOpen()
14.     {
15.         EditorWindow.GetWindow(typeof(SampleWindow));
16.     }
17.  
18.     void OnGUI()
19.     {
20.         Colliders = EditorGUILayout.Foldout(Colliders, "Colliders");
21.         if (Colliders)
22.         {
23.             //Here I need to input scale values and build Box Collider with these values
24.  
25.             EditorGUILayout.BeginHorizontal();
26.             if (GUILayout.Button("Box", GUILayout.MinWidth(115), GUILayout.MaxWidth(135)))
27.             {
28.                 GameObject build = new GameObject("Box");
29.                 BoxCollider collider = build.AddComponent<BoxCollider>();
30.                 collider.isTrigger = true;
31.                 Selection.activeGameObject = build;
32.             }
33.             if (GUILayout.Button("Mesh", GUILayout.MinWidth(115), GUILayout.MaxWidth(135)))
34.             {
35.                 GameObject build = new GameObject("Mesh");
36.                 build.AddComponent<UnityEngine.MeshCollider>();
37.                 Selection.activeGameObject = build;
38.             }
39.             EditorGUILayout.EndHorizontal();
40.         }
41.     }
42. }