<UniformGrid Width="200" Height="200">
<TextBlock Text="TextBlock" HorizontalAlignment="Left" VerticalAlignment="Top"/>
</UniformGrid>
Then copy & paste the TextBlock
<UniformGrid Width="200" Height="200">
<TextBlock Text="TextBlock" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,49.54,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,49.54,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,49.54,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,16.207,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,16.207,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,16.207,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,16.207,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,16.207,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,-0.46,0" d:LayoutOverrides="Width"/>
<TextBlock Text="TextBlock" VerticalAlignment="Top" Margin="0,0,-0.46,0" d:LayoutOverrides="Width"/>
</UniformGrid>