src/MCM.UI/GUI/Brushes/ExpandIndicator.xml
<Brushes>
<Brush Name="MCM.ExpandIndicator" GlobalAlphaFactor="0.6">
<Layers>
<BrushLayer Name="Default" Sprite="StdAssets\expanded" />
</Layers>
<Styles>
<Style Name="Default">
<BrushLayer Name="Default" Sprite="StdAssets\collapsed" />
</Style>
<Style Name="Selected">
<BrushLayer Name="Default" Sprite="StdAssets\expanded" />
</Style>
</Styles>
</Brush>
</Brushes>