MenuBar sample seems to be leaking through F10 accelerator

Steps to reproduce:
- Run Ensemble in Monitor Application profile mode
- Go to MenuBar sample
- Go to some other sample
- Create a memory dump
- Use the following OQL query to see that Menu sample page is not garbage collected:
select { SamplePage: x, title: x.titleProperty.value.toString() }
from ensemble.samplepage.SamplePage x
- See the nearest GC root of "Menu" sample SamplePage instance
- Notice keyboardShortcutsHandler > accelerators > ... value, where value key KeyCodeCombination which code is F10.