OnClick behaviour not working

[Thomas-Vos]

The new click behaviour will come in very handy for me. Unfortunately, I cannot get it working for my knob configuration. Here is the Knob style I'm using:

<style name="KnobStyle">
    <item name="kNumberOfStates">21</item>
    <item name="kSwipe">circular</item>
    <item name="kMinAngle">-120</item>
    <item name="kMaxAngle">120</item>
    <item name="kKnobColor">?attr/colorAccent</item>
    <item name="kKnobRelativeRadius">0.75</item>
    <item name="kKnobCenterRelativeRadius">0.75</item>
    <item name="kIndicatorRelativeLength">0.35</item>
    <item name="kStateMarkersAccentWidth">2dp</item>
    <item name="kStateMarkersWidth">2dp</item>
    <item name="kFreeRotation">false</item>
    <item name="kBorderWidth">0dp</item>
    <item name="kStateMarkersAccentPeriodicity">5</item>
    <item name="kStateMarkersAccentColor">?android:attr/textColorPrimary</item>
    <item name="kSelectedStateMarkerContinuous">true</item>
    <item name="kSelectedStateMarkerColor">?attr/colorAccent</item>
    <item name="kStateMarkersColor">?android:attr/textColorSecondary</item>
    <item name="kClickBehaviour">user</item>
</style>

Here is the Java code:

knob.setUserBehaviour(new Runnable() {
    @Override
    public void run() {
        Toast.makeText(getContext(), "Knob clicked!", Toast.LENGTH_SHORT).show();
    }
});

The Toast message does not show when I click the Knob. If I change kSwipe to horizontal it does work, but I really want to keep it on circular. Any suggestions?