Tracklist overlaying album panel

I'm trying to add a track list that appears on top of a panel list of album covers. 

I have got as far as the screenshots below before finding that I can't seem to move focus from the panel list of albums to the track list. Track list is in an include (control id=55) and is hidden in all other views by using <visible>Container.Content(songs)</visible>. It then appears when clicking on an album, I just (infuriatingly!) can't move the focus to that list!

In my panel list I was assuming I could simply use <onclick>SetFocus(55)</onclick> but when I add this in the xml the track list no longer appears when clicking on an album (nothing happens at all).

I think what's happening is the focus changes from the panel list before the track list has a chance to fill with content based on the focus on the album in the panel list.

I'm really hoping there's a simple solution to this or a workaround, perhaps with a python script if necessary?