Right-To-Left Span

Main.xaml

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
  <StackPanel Margin="1">
    <StackPanel Background="DarkBlue">
      <TextBlock FontSize="20" FlowDirection="RightToLeft">
        <Run FlowDirection="LeftToRight" Foreground="LightBlue">العالم</Run>
        <Run FlowDirection="LeftToRight" Foreground="Red">فى سلام</Run>
      </TextBlock>
      <TextBlock FontSize="20" FlowDirection="LeftToRight">
        <Run FlowDirection="RightToLeft" Foreground="LightBlue">العالم</Run>
        <Run FlowDirection="RightToLeft" Foreground="Red">فى سلام</Run>
      </TextBlock>
      <TextBlock FontSize="20" Foreground="CornflowerBlue">العالم فى سلام</TextBlock>
    </StackPanel>
    <StackPanel Background="LightBlue">
      <TextBlock FontSize="20" FlowDirection="RightToLeft">
        <Span Foreground="Red" FlowDirection="LeftToRight">Hello</Span>
        <Span Foreground="DarkBlue" FlowDirection="LeftToRight">World</Span>
      </TextBlock>
      <TextBlock FontSize="20" FlowDirection="LeftToRight">
        <Span Foreground="Red" FlowDirection="RightToLeft">Hello</Span>
        <Span Foreground="DarkBlue" FlowDirection="RightToLeft">World</Span>
      </TextBlock>
      <TextBlock FontSize="20" Foreground="CornflowerBlue">Hello World</TextBlock>
    </StackPanel>
  </StackPanel>
</Page>