<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Width="100">
    <Button Background="Red">No Scaling</Button>
    <Button Background="Orange">
      <Button.RenderTransform>
        <ScaleTransform ScaleX="2"/>
      </Button.RenderTransform>
      X
    </Button>
    <Button Background="Yellow">
      <Button.RenderTransform>
        <ScaleTransform ScaleX="2" ScaleY="2"/>
      </Button.RenderTransform>
      X + Y
    </Button>
    <Button Background="Lime">
      <Button.RenderTransform>
        <ScaleTransform ScaleY="2"/>
      </Button.RenderTransform>
      Y
    </Button>
  </StackPanel>
</Canvas>