Hide on lost focus in the panels.

[Edir]

I would like to understand why the icons in panels are not been hidden
automatically when they lost focus!

For example, when you want to change the volume of the speakers, you click
on volume control, change it and them you need to click on the icon to
close. Why don't hide it when the focus is lost? This occurs to all the
tools, calendar, deskbar, etc. If an option on panel lost its focus, this
means i don't want to use it!
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