Right-To-Left UniformGrid

Main.xaml

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
  <UniformGrid Rows="2" Columns="4" FlowDirection="RightToLeft">
    <Label Content="1" Background="Black"/>
    <Label Content="2" Background="DarkGray"/>
    <Label Content="3" Background="Teal"/>
    <Label Content="4" Background="Navy"/>
    <Label Content="5" Background="DarkOrchid"/>
    <Label Content="6" Background="Maroon"/>
    <Label Content="7" Background="DodgerBlue"/>
    <Label Content="8" Background="IndianRed"/>
  </UniformGrid>
</Page>