Inherit styles in avalonia

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Avalonia

I want to have the ReturnButton to be BasedOn the SetupButton style. How do I inherit styles? I want to base the Selector="Button.ReturnButton" on the Selector="Button.SetupButton"

<Style Selector="Button.SetupButton">
	<Setter Property="HorizontalAlignment" Value="Center"/>
	<Setter Property="VerticalContentAlignment" Value="Center"/>
	<Setter Property="BorderBrush" Value="Transparent"/>
	<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
	<Setter Property="VerticalContentAlignment" Value="Stretch"/>
	<Setter Property="Template">
	<Setter.Value>
	   <ControlTemplate TargetType="Button">
	      <ContentPresenter x:Name="contentPresenter"
		  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
		  VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
		  Content="{TemplateBinding Content}"
		  RecognizesAccessKey="True"
		  RenderTransformOrigin="0.5,0.5"/>
	      </ControlTemplate>
	</Setter.Value>
	</Setter>
</Style>

<Style Selector="Button.ReturnButton">
	<Setter Property="HorizontalAlignment" Value="Center"/>
	<Setter Property="VerticalContentAlignment" Value="Center"/>
	<Setter Property="BorderBrush" Value="Transparent"/>
	<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
	<Setter Property="VerticalContentAlignment" Value="Stretch"/>
	<Setter Property="Template">
	   <Setter.Value>
		<ControlTemplate>
		   <Grid>
		      <Image Source="/Assets/SetUp/icon_nav_return_alice.bmp" 
				Classes="SetupButtonImage"/>
		   </Grid>
		</ControlTemplate>
	   </Setter.Value>
	</Setter>
</Style>

There was the BasedOn in WPF, but that seems to have disappeared, and not been replaced

What I have tried:

Have tried to use Selector="Button.SetupButton.ReturnButton".