public void Redo()
{
lock (m_redo)
{
if (m_parentGroup.GetSceneMaxUndo() > 0)
{
UndoState nUndo = new UndoState(this);
m_undo.Push(nUndo);
}
UndoState gofwd = m_redo.Pop();
if (gofwd != null)
gofwd.PlayfwdState(this);
}
}