Align button content

You don't need the StackPanel or the TextBlock. All you need is

<Button HorizontalContentAlignment="Left" Content="Save" />

wpf controls templates wpf-controls

You can align in two way, Horizontal and Vertical

<Button Content="Export" VerticalContentAlignment="Bottom" name="MyBtn1"  />

<Button Content="Export" HorizontalContentAlignment="Center" name="MyBtn2"  />

See the follow image to view the possibilities settings:

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