Hello ~
The easiest way to rotate a mesh in real-time is by using a Model. So in a project containing your mesh & bitmap follow these steps ..
1 - Add a Model component to App:Content & set the RotationVelocity property to the desired velocity.
2 - Add a RenderMesh component to Model:OnRender & set the Mesh property to your Mesh.
3 - Add a SpawnModel component to App:OnLoaded & set the Model property to your Model.
Now if you would want to texture your mesh, continue with these steps.
4 - Add a Material component to App:Content.
5 - Add a MaterialTexture component to Material:Textures & set the Texture property to your Bitmap.
6 - Add a UseMaterial component in Model:OnRender & set the Material property to your Material*
*Make sure to move the UseMaterial component above RenderMesh as pictured.
Attached is a example project containing these steps.
Good luck ~
K