com.unity.uiextensions/Scripts/ToolTips/BoundTooltip/BoundTooltipItem.cs

///Credit Martin Nerurkar // www.martin.nerurkar.de // www.sharkbombs.com
///Sourced from - http://www.sharkbombs.com/2015/02/10/tooltips-with-the-new-unity-ui-ugui/

namespace UnityEngine.UI.Extensions
{
    [AddComponentMenu("UI/Extensions/Bound Tooltip/Bound Tooltip Item")]
    public class BoundTooltipItem : MonoBehaviour
    {
        public bool IsActive
        {
            get
            {
                return gameObject.activeSelf;
            }
        }

        public UnityEngine.UI.Text TooltipText;
        public Vector3 ToolTipOffset;

        void Awake()
        {
            instance = this;
            if(!TooltipText) TooltipText = GetComponentInChildren<Text>();
            HideTooltip();
        }

        public void ShowTooltip(string text, Vector3 pos)
        {
            if (TooltipText.text != text)
                TooltipText.text = text;

            transform.position = pos + ToolTipOffset;

            gameObject.SetActive(true);
        }

        public void HideTooltip()
        {
            gameObject.SetActive(false);
        }

        // Standard Singleton Access
        private static BoundTooltipItem instance;
        public static BoundTooltipItem Instance
        {
            get
            {
                if (instance == null)
                    instance = GameObject.FindObjectOfType<BoundTooltipItem>();
                return instance;
            }
        }
    }
}