Post thread button to open in overlay in sidenav

[JoyFreak]

I'm trying to get the overlay to open as expected in forum_view from a sidenav template/widget but not luck.
Code:

    <xf:if is="$xf.visitor.canCreateThread() OR $xf.visitor.canCreateThreadPreReg()">
        <xf:button href="{{ $canCreateThreadInChild ? link('forums/post-thread-chooser', null, {'forum_id': $forum.node_id}) : link('forums/post-thread', $forum) }}" overlay="{$canCreateThreadInChild}" class="button--cta jf_thread_sidebar" style="width:100%;" icon="write">
            {{...

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