public virtual void Add(Control child)
{
child.Parent = owner;
int idx = children.Add(child);
owner.OnChildrenChanged(child, null, idx);
}
/// <summary>
/// Disconnects a child.
/// </summary>
private void DisconnectChild(int index)
{
Debug.Assert(items[index] != null);
Control child = items[index];
// Every function that calls this function needs to call VerifyAccess to prevent
// foreign threads from changing the tree.
Control oldParent = child.Parent;
items[index] = null;
child.Parent = null;
//Control.PropagateFlags(_owner, Control.Flags.IsSubtreeDirtyForRender);
version++;
//Control.PropagateSuspendLayout(child);
oldParent.OnChildrenChanged(null /* no child added */, child, index);
}