removed title from parameters where unnecessary
fix Update function
handle visibility from associated owner for all glow windows
Merge pull request #842 from thoemmi/better-dialog-api

Removed title parameter from ShowMetroDialogAsync
update clean and flyout example with hide/show
OnlyLoadTransition for MetroContentControl

this is used by MetroWindow and CleanWindow to avoid running the
transition twice, if hidden window is shown again
use VirtualisedMetroListView in flyout example
Remove the Unwrap here because it doesn't work for whatever reason
Merge pull request #843 from MahApps/839-punker76-trouble-with-glowbrush

fix the trouble with glowbrush when Window hide/show
Merge remote-tracking branch 'upstream2/master'