FULL PRODUCT VERSION :
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
macOS Sierra v 10.12.5

A DESCRIPTION OF THE PROBLEM :
Start VisualVM. Connect to running instance, Start CPU Sampler. Click 'Snapshot' button. On the generated snapshot whenever you click: (right click) 'Show Subtree' the layout is reset. For example if I add the 'number of samples' column, that will disappear whenever I drill down on a subtree.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
- Start VisualVM.
- Connect to running instance,
- Start CPU Sampler.
- Click 'Snapshot' button.
- Go to the snapshot view
- add 'samples' column to view
- select subtree, right click 'Show Subtree'
- subtree is shown as root of the view as expected, BUT the layout is reset, I expect the layout settings to be preserved even if I drill down.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect the layout settings to be preserved even if I drill down.
ACTUAL -
Layout settings get reset to original values every time I drill down

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
manually add the column to the view each time you drill down