Need Help Creating ToolTips

[StarRocks]

I have tried following a guide on wowwiki to create a tool tip and I have come up with this

		<Scripts>
		<GameTooltip name="ToolTip" inherits="GameTooltipTemplate">
		<OnEnter>
       			self:SetOwner(Test_Button, "TOPRIGHT");
			self:SetText("I am a tool tip");
			GameTooltip:Show()
		</OnEnter>
		<OnLeave>
		GameTooltip:Hide()
		</Onleave>
   		</Scripts>
 		</GameTooltip>

Its seems to be wrong. So I just need some help to create a tooltip in XML that when I mouse over a button, it creates a tooltip with custom text.

The guide I tried to follow is this http://www.wowwiki.com/UIOBJECT_GameTooltip