static [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > MakeAddFilterButton ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SBasicFilterBar](API\Developer\ToolWidgets\Filters\SBasicFilterBar)< FilterType >> InFilterBar )