FPaintArgs
( const SWidget* PaintParent, FHittestGrid& InRootHittestGrid, FVector2D InWindowOffset, double InCurrentTime, float InDeltaTime)
( const SWidget* PaintParent, FHittestGrid& InRootHittestGrid, FHittestGrid& InCurrentHitTestGrid, FVector2D InWindowOffset, double InCurrentTime, float InDeltaTime)