Align left along StackPanel
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Button HorizontalAlignment="Left"
Width="100"
Margin="10,10,10,10">Button 1</Button>
<Button HorizontalAlignment="Left"
Width="100"
Margin="10,10,10,10">Button 2</Button>
<Button HorizontalAlignment="Left"
Width="100"
Margin="10,10,10,10">Button 3</Button>
</StackPanel>
</Page>
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