Show children tree in "Hot Spots" View

We often have same method "f()" at various locations in the "Forward calls" view.
Example calltree:
X.methodX()
-> F.f()
-> Y.methodY()
----> F.f()
----> Z.methodZ()
------> F.f()

The Hot Spot View currently show the Total Time of of all F.f(x) calls Thats good. But i also would like to know the accumulated total time of each children of f(x).
assume F.f() calls F.y() and F.z() it would be of much help to see a tree in the "Hot Spots" View like

F.f()
--> F.y()
--> F.z()

i.e. the Hot Spot View should be like the Forward Calls but with all distinct methods as root items (instead of Threads)
If any method is called recursive the view should stop at the selfrecursion. For example assume F.z() calls F.f() the view should look like

F.f()
--> F.y()
--> F.z()
-----> [selfrecursion] F.f()
possibly with a neat icon for [selfrecursion]

Start by locating the Java implementation of the "Hot Spots" and "Forward Calls" views. Trace how methods and call relationships are aggregated, then determine how distinct methods should become roots and where self-recursion is detected. Done means the Hot Spots view shows accumulated child trees and stops recursive branches with a clear self-recursion marker.