Model not responding for XNA model viewer GUI

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C#

XNA4.0

I am using XNA model viewer which is hosted here https://modelviewer.codeplex.com/[^]

It basically displays a FBX model and we can see the movement of individual parts of model by moving the bones in the model.

I created a 3D model from Blender 2.9 with armature. I exported as FBX model,loaded the model in XNA model viewer.

But when I am loading that model in viewer it is not responding the way I expect. If I select some bone and try to change the value of rotation, the body part corresponding to that bone is not responding.

In fact if i check the "Draw Bone" option one thin skeleton is displayed orthogonal to model and that is respond for the changes in the rotation of bones.

Where the error are mistake lies ?