protected void MarkAsChild(FxObject obj)
{
obj.Parent = this;
// deferred creation of Children...
if (_children == null)
{
_children = new List <FxObject>();
}
_children.Add(obj);
}
protected void RemoveChild(FxObject obj)
{
_children.Remove(obj);
}
protected void AddChild(FxObject obj)
{
MarkAsChild(obj);
}