To reproduce:
- run Ensemble,
- navigate to Menu sample,
- click Options in sample menu bar
- navigate back to home page
- use jvisualvm from JDK bin to generate a heap dump
- use the following query to see not garbage collected pages:
select x
from ensemble.samplepage.SamplePage x

here is what observed in Find Nearest GC Root from thread dump of those SamplePages:

keyboardShortcutsHandler > ... > accelerators > ... > Shortcut + C

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Second example:
- use Ensemble from build that doesn't contain changeset 92cdacb550e0 "Ensemble8: Fix for RT-33660 TabPane app is leaking through mnemonics mechanism"
  *or*
  alter TabPaneApp.java in Ensemble8 source code by commenting out the following line:
radioButton.setMnemonicParsing(false);
- run this version of Ensemble8,
- open TabPane sample
- go to home page
- use jvisualvm from JDK bin to generate a heap dump
- use the following query to see not garbage collected pages:
select x
from ensemble.samplepage.SamplePage x

here is what observed in Find Nearest GC Root from thread dump of those SamplePages:

keyboardShortcutsHandler > ... > accelerators > ... > Alt + T