Actually I was wrong - I had thought that using `self.closeEvent` may works
in Maya 2018, but turns out it is not.
Need any insights on this. Much appreciated in advance!
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I managed to have find a resolution.
Instead of using `dockCloseEventTriggered`, using of `closeEvent` seems to
have resolve it.
I have to write my UI create code to include something as follows:
self.ui.closeEvent = self.closeEvent
And this seems to be picking up in both Maya 2017 and 2018. Or
