Extracting Adapted Mesh in FEniCS

To extract the adapted mesh the code used was:

mesh0 = mesh.root_node()
mesh1 = mesh.leaf_node()
plot(mesh0, title="Initial mesh")
plot(mesh1, title="Final mesh")

This no longer seems to work and throws an error:

AttributeError: 'dolfin.cpp.mesh.Mesh' object has no attribute 'root_node'

I would like to know how to do this on the newer version. Any suggestion would be very helpful.
Thank You.

Dear Sir, do you have any way to solve this problem?

Its been solved in your question here - Mesh plot in AdaptiveSolver