WordPress/src/main/res/drawable/calypso_segmented_control_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:left="-1dp" android:top="-1dp" android:bottom="-1dp">
        <shape>
            <solid android:color="@android:color/transparent" />
            <stroke
                android:width="1dp"
                android:color="@color/grey" />
        </shape>
    </item>
</layer-list>