public void ConstructMouseMove(IMapDocument doc, System.Windows.Forms.MouseEventArgs e)
{
if (_mousePressed && _addContainer != null && _addContainer.Elements.Count == 1 && ActiveDisplay(doc) != null)
{
double x = e.X;
double y = e.Y;
ActiveDisplay(doc).Image2World(ref x, ref y);
((Freehand)_addContainer.Elements[0]).AddPoint(x, y);
ActiveDisplay(doc).DrawOverlay(_addContainer, true);
}
}