public void Render(IElement rootComponent)
{
var sw1 = Stopwatch.StartNew();
context = new UIContext(box, buffer);
rootComponent.Draw(new Point(0, 0), new BoxConstraint(0, box.Width, 0, box.Height), context);
buffer.ApplyChanges(box);
box.Flush();
box.SetCursor(context.CursorPosition.X, context.CursorPosition.Y);
box.SetCursorVisibility(context.CursorVisible);
sw1.Stop();
//Trace.WriteLine(" Render: " + sw1.ElapsedMilliseconds.ToString());
}