private bool OnModifyThroughPointsWithMouse(IPropertyEntry sender, int index)
{
GeneralGeoPointAction gpa = new GeneralGeoPointAction(bSpline.GetThroughPoint(index), bSpline);
gpa.UserData.Add("Mode", "ThroughPoint");
gpa.UserData.Add("Index", index);
gpa.GeoPointProperty = sender as GeoPointProperty;
gpa.SetGeoPointEvent += new CADability.Actions.GeneralGeoPointAction.SetGeoPointDelegate(OnSetThroughPoint);
Frame.SetAction(gpa);
return(false);
}