Overriding onclick in MyVideoNav possible?

Hi,
I'm playing around with Estuary and try to change the behaviour of the onclick action in the video navigation. From what i got from the skinning manual i can override the onclick on lists. So i tried to modify the widelist and added an onclick tag like this 

<includes>

    <include name="View_55_WideList">

        <control type="group">

            <include>OpenClose_Right</include>

            <visible>Control.IsVisible(55)</visible>

            <include>Visible_Right</include>

            <control type="fixedlist" id="55">

                <left>594</left>

                <top>list_y_offset</top>

                <bottom>list_y_offset</bottom>

                <right>0</right>

                <scrolltime tween="cubic" easing="out">500</scrolltime>

                <orientation>vertical</orientation>

                <onclick>RunPlugin(plugin://plugin.program.relatedmedia?store=1)</onclick>

But nothing is happening, as in the default click is still happening but not the onclick. Can someone tell me if this not possible or what i'm doing wrong.

Thanks