Question How to change a Button background color on hovering?

Hello,

I have a custom inspector window, with a button at the bottom. I'd like it to have a given color when hovering it.
Here's what I did:

Code (CSharp):

1. [CustomEditor(typeof(FurnitureAlternatives))]
2. public class FurnitureAlternativesEditor : Editor
3. {
4. ...
5. Texture2D bwGreen;
6. ...
7.  
8. private void OnEnable()
9. {
10.     bwGreen = MakeTex(2, 2, new Color(0.11372f, 0.73333f, 0.6941176f));
11. }
12.  
13. private Texture2D MakeTex(int width, int height, Color col)
14. {
15.     Color[] pix = new Color[width * height];
16.     for (int i = 0; i < pix.Length; ++i)
17.     {
18.         pix[i] = col;
19.     }
20.     Texture2D result = new Texture2D(width, height);
21.     result.SetPixels(pix);
22.     result.Apply();
23.     return result;
24. }
25.  
26. private GUIStyle GetButtonStyle()
27. {
28.     GUIStyle buttonStyle = new GUIStyle();
29.     buttonStyle = GUI.skin.button;
30.     buttonStyle.hover.background = bwGreen;
31. }
32. }
33.  
34. public override void OnInspectorGUI()
35. {
36.     ...
37.     buttonStyle = GetButtonStyle();
38.     if (GUILayout.Button("Save furniture position and orientation", buttonStyle))
39.     {
40.                // Do stuff
41.     }
42.     ...
43. }
44.  

And here's what I observe. The normal button:


and the hovered button (hard to see it here, but there's a slight difference ):


So, it seems this is just the default hover behavior, not taking into account the background I defined.
I did do some test by modifying the buttonStyle.hover.textColor, and it works well.

Can anyone help?
Thanks a lot,
Arnaud