BarsAgo

An int value representing the number of bars ago of the draw object

Time

A DateTime structure representing the time of the draw object

Pen

The Pen object used to draw the object

protected override void OnBarUpdate()
{

    // Draws a Vertical Line
    IVerticalLine vLine = DrawVerticalLine("tag1", 10, Color.Black);

    // Print the number of bars ago the line is located at

    Print(vLine.BarsAgo);
}