Helix toolkit Tessellation samples is not rendering model - sharpdx

Able to Build the tessellation sample application provided in the following path: helix-toolkit/Source/Examples/WPF.SharpDX/TessellationDemo/
When I run the application , i did not see any model rendering. refer screenshot.
Screen shot of tessellation sample application
Please help me.

I found the answer. In my code geometry null or not checking condition is wrong.
thanks

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