The verical line should be drawn on the chart when there is a mouse over event. It should act like a vertical pointer on the chart (the line should have the height as that of the chart), and the details of each of the data points (each point on X axis) on the chart, will be shown in a small popup window.
I tried the CustomGridLine, but this line does not move smoothly along each of the points on x axis, on mouse move it directly jumps to the next vertical line in the Grid.