add window commands to flyout demo
introduce WindowButtonCommands
fix button height of WindowCommands
don't focus FlyoutsControl
don't focus MetroContentControl
introduce ShowWindowCommandsOnTop

! fix ZIndex if more than flyouts are open
! allow for flyout.Position == Position.Top too
add ShowWindowCommandsOnTop to flyouts example
some cosmetics to flyout demo
change header template if feature is on
PART_BackButton always at bottom
fix TextElement.Foreground

should be FlyoutWhiteBrush
Merge pull request #709 from MahApps/708-punker76-windowcommands-with-flyouts

extend feature windowcommands over flyouts #708
enhance flyout demo
fix #515 flyout use now always the dark theme
add CustomFlyout to NET45 demo
ThemeManager recursive search
fix Caliburn.Metro.Demo

i don't know enough about Caliburn.Metro.Demo to solve the problem like
in normal demo, but this works now
improve Flyout3View example
fix Foreground for ListViewItem
update custom flyout demo for @spiritdead