manish gupta

I have financial graph where there is one main graph and second graph which is a shows a technical indicator graph in Annual % average in percentage format. now my problem is that the main graph shows the toolTip in this format 12/31/2012 Open:201 Hi:256 Low:199 Close: 240 and second graph shows the % on Y axis but when i mouse over on the graph line it the tooltip shows same values as above graph instead of percentage. so how to set the tooltip for second graph. thanks in advance manish