Set CentreX and CentreY properties of CompositeTranform in WPF

Question

CentreX and CentreY refer to which transformGroup in WPF - SkewTransform/ScaleTransform/RotateTransform ??

This is the original composite statement :

<CompositeTransform CenterY="0.434" CenterX="0.499" ScaleY="1.14" TranslateY="-0.093"/>

I have transformed it in wpf as :

<TransformGroup>
     <ScaleTransform ScaleY="1.14" />
     <RotateTransform />
     <TranslateTransform Y="-0.093" />
     <SkewTransform />                                            
</TransformGroup>

I am not sure for which transform should I set the CentreX and CentreY properties.