Fail to enable Visual Xccelerator Engine in Trial version

Hi, i had download the Scichart v6 Trial version. I am trying to enable the Visual Xccelerator Engine. I do it following the tutorial as below:

s:VisualXcceleratorEngine.FallbackType=”{x:Type s:HighQualityRenderSurface}”
s:VisualXcceleratorEngine.DowngradeWithoutException=”False”
s:VisualXcceleratorEngine.EnableImpossibleMode=”True”

But when i check with (RealTimeGraph.RenderSurface.GetType() == typeof(VisualXcceleratorRenderSurface)), it show that i am fail to turn on the Visual Xccelerator Engine.

Attach is my DirectX window.
Kindly advise