How to get the exact time of a High

Hi All, 

Hopefully an easy one. 

I want to find the exact time a high price occurred. 

I have the following code that plots the last 4 Monthly High points:

var monthhigh = MarketData.GetBars(TimeFrame.Monthly, Symbol.Name);

for (int i=0; i<5; ++i)
{

    Chart.DrawTrendLine("MonthHigh" + i, monthhigh.Last(i).OpenTime, monthhigh.Last(i).High, Server.Time.AddDays(1), monthhigh.Last(i).High, Color.Green, 2, LineStyle.DotsVeryRare).Comment = "H";

}

The problem is i can only seem to plot the line from the Open of the Month, as shown:

monthhigh.Last(i).OpenTime

Is it possible to get the actual DateTime of the high? 

Thanks in advance