public void ConstructMouseDown(IMapDocument doc, System.Windows.Forms.MouseEventArgs e)
{
if (ActiveDisplay(doc) == null)
{
return;
}
Freehand element = new Freehand();
_addContainer = new GraphicsContainer();
_addContainer.Elements.Add(element);
_mousePressed = true;
double x = e.X;
double y = e.Y;
ActiveDisplay(doc).Image2World(ref x, ref y);
element.AddPoint(x, y);
}