UWP WrapPanel

Wraps elements of variable sizes Vertical or Horizontal

<helpers:WrapPanel Direction="Vertical" HorizontalSpacing="10" VerticalSpacing="10" x:Name="wrappanel">
  <Rect Fill="Red" Width="200" Height="150" />
  <Rect Fill="Red" Width="400" Height="100" />
  <Rect Fill="Red" Width="100" Height="80" />
</helpers:WrapPanel