Rendering settings for when the control is turned on and the mouse is hovering it.

	function OnGUI() {
		GUI.skin.button.onHover.textColor = Color.cyan;
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnGUI() {
        GUI.skin.button.onHover.textColor = Color.cyan;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnGUI() as void:
		GUI.skin.button.onHover.textColor = Color.cyan