Question Text colors dont change if I set a background texture in style and other issues

I am trying to recreate the Hierarchy window for a custom EditorWindow I am working on. I have it displaying and I am using EditorStyles.foldoutHeader for parent objects so it shows the > arrow, I cant seem to find an EditorStyle that has the down arrow for when it is expanded, so I am trying to add my own styles using the foldoutheader style as the base.

So I create a new style based on the old one, and if I dont change anything it works just the same. I then change the various colors for hover etc and that works fine as well. But if I set a new background texture in the hover style then I can see the texture but now the colors dont change.

Also if I change the texture how does that work with the dark and light themes?

This is the code to make the new style:

Code (CSharp):

1.             if ( text == null )
2.                 text = new Texture2D(1, 1);
3.  
4.             buttonStyle = new GUIStyle(EditorStyles.foldoutHeader);
5.             buttonStyle.normal.textColor = Color.blue;
6.             buttonStyle.onNormal.textColor = Color.white;
7.             buttonStyle.onHover.textColor = Color.black;
8.             buttonStyle.hover.textColor = Color.cyan;
9.             buttonStyle.onActive.textColor = Color.green;
10.             buttonStyle.onFocused.textColor = Color.red;
11.             buttonStyle.normal.background = text;
12.  

And here is the result without setting the background texture, you can see the colours are changing:

And the same when I set the background texture, colours are all the same: