Extensions.WPF
Note: still needs polishing such as documentation etc ...
NuGet package : https://www.nuget.org/packages/Extensions.WPF/
Behaviors
AnimatedExpanderBehavior : animates the expansion of an Expander
AnimatedScrollingBehavior : smooth scrolling page by page for a ScrollViewer
AutoFontSizeBehavior : auto sizes a TextBlock font to fit in a control, useful for text thumbnails
ListBoxScrollDownBehavior : scroll down to the last item added in a ListBox
ScrollViewerHorizontalScrollingBehavior : horizontal scrolling for a ScrollViewer
ScrollViewerNoArrowsBehavior : suppresses the scroll bars on a ScrollViewer (preliminary)
Gestures
Mouse wheel with/without modifiers gestures for commands