internal override void OnDeleteAllPointsCommand(object obj)
{
var mode = obj.ToString();
if (string.IsNullOrWhiteSpace(mode))
return;
if (mode == VisibilityLibrary.Properties.Resources.ToolModeObserver)
base.OnDeleteAllPointsCommand(obj);
else if (mode == VisibilityLibrary.Properties.Resources.ToolModeTarget)
DeleteTargetPoints(TargetAddInPoints.ToList());
}