Again thank you Eric for the suggestion. Looking at the FullForm will also be a good learning exercise. By the way, another reason I want to see indices is because, many of my calculations use indices. For instance, if you are calculating trendlines, their equations are based on the index of the bar. not the date. So, if a trendline says that it is based on the lows of bars 11 and 43, I want to see bars 11 and 43 on the chart.

Thanks again for the suggestion.

Hello Rohit, actually it is easier for me to think of a bar location in terms of its index. If I know that I am displaying 64 bars and I want to look at bar# 32, I know that it is roughly in the middle (actually exactly in the middle) of the chart. Once I get the cursor over the bar that is roughly in the middle, I would want to see its index and if the current bar was at index 28, I would know to move 4 bars to the right. Quite easy and simple.

On the other hand, dealing with dates, assume the chart is running from Feb. 4 to November 24 and you are interested in the bar on September 13. It simply is not as easy.

And from a more general perspective, I would like to know if it is possible to modify what is displayed at the top of the chart.

And, yes, the date doesn't change but the index does, depending on the date range being covered. But when I debug the code and something goes wrong on bar# 23, I may want to see what the values were for, say the last 15 bars because I am calculating a 15-day moving average for example. Or I might want to look at the last N bars or the 5th to last bar [[-5]]. All of that is much easier (at least for me) to deal with in terms of indices rather than dates.

So, I still would like to know if I can modify the string/information displayed at the top of the chart whenever I move the cursor over a particular bar. At that point working with indices

Thank you for offering help Eric. Let me be a bit clearer.

1) Yes, I use explicit FinancialData of the form {{#Date, {#Open, #High, #Low, #Close, #Volume}}}. using the following code

makeChart[currentCandles_Dataset] := 
  TradingChart[{#Date, {#Open, #High, #Low, #Close, #Volume}} & /@ 
    currentCandles];

where I have a Dataset called currentCandles which, among other things, contains the Date,Open,High,Low,Close and Volume of each candle.

At the moment, if I display a TradingChart or an InteractiveTradingChart, the information at the top of the charts is O,H,L,C and Date of the candle currently under the cursor.

My application provides information such as "There is a peak at bar #6" or "A trendline was broken at bar #23". So, when I want to visualize if the output of my algorithm is correct, I use the TradingChart and I try to go to bar #N rather than go to bar on Tuesday, December 4.

It would be easier for me to zoom in on a bar quickly if I simply could see the index of the bar (meaning its index in the Dataset). That is why I would love to be able to add a string like "I: N" at the front of the information currently being presented by the TradingChart.

Is this clearer? Thank you for any help.