Adapt the ListViews disabled state to the ListBox disabled state
Merge pull request #468 from MahApps/listview-disabled-style

Adapt the ListViews disabled state to the ListBox disabled state
just get out of my way you silly artifacts
ComboBox virtualizing is disabled
If a control of type ItemsPresenter is used as item presenter, then the virtualization of the ComboBox is being disabled. Use VirutalizingStackPanel instead and set the property IsItemsHost to true.

Conflicts:
	MahApps.Metro/Styles/Controls.ComboBox.xaml
New features:
* Horizontal scroll bar: Show the scroll bar when panorama scrolling and wait a second to hide
* Mouse scroll: Use mouse wheel to scroll panorama
Both are independently and can be seted by xaml
Added a threestate CheckBox to the demo
Panorama dynamic group header - Use property DynamicGroupHeader of Panorama control to set behavior
Update PanoramaGroupHeaderConverter.cs

Change default margin
Update Panorama.xaml

Change default margin
Adjust project file

Ajust project file to include PanoramaGroup header converter
Added vertical sliders to the demo project
hwhoops this is kinda important