How to change volume through clock_skin.xml (tapping at center)

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Please tell me which is the correct process to change the volume when I tap at the center of watch.
I am trying this but it must be wrong (I can’t find the correct process name)

<drawable>
	<arraytype>100</arraytype>
	<centerX>0</centerX>
	<centerY>0</centerY>
<!--	<range>30</range> -->
	<cls>com.android.systemui.settings.VolumeDialog</cls>
	<pkg>com.android.systemui</pkg>
    </drawable>

I take it like the BrightnessDialog … but it must be wrong
Thanks